See some background information and definitions on liver
The
use of high doses increases the likelihood that potentially
significant toxic effects will be identified. Findings of
adverse effects in any one species do not necessarily indicate
such effects might be generated in humans. From a conservative
risk assessment perspective however, adverse findings in
animal species are assumed to represent potential effects
in humans, unless convincing evidence of species specificity
is available.
--
Food and Agricultural Organization of the United Nations
|
Note:
This is not an exhaustive list.
When time allows more information will be added.
Acifluorfen,
sodium -
Herbicide - CAS No. 62476-59-9
Carcinogenicity.
Acifluorfen has been classified as a Group B2 (probable human
carcinogen) chemical by the OPP Cancer Peer Review Committee (CPRC),
based on an increased number of liver tumors in both sexes of
mice and a high incidence of uncommonly
occurring stomach papillomas in male mice. The
Committee recommended using the Q1* approach for quantification
of human risk. The Q1* is 0.11 (mg/kg/day)-1.
Ref: Federal Register. July 25, 1997. Sodium
Salt of Acifluorfen; Pesticide Tolerances for Emergency Exemptions.
Final Rule.
http://www.epa.gov/fedrgstr/EPA-PEST/1997/July/Day-25/p19668.htm
Male
mice had a significant increasing trend,
and significant differences in the pair-wise comparisons of all
dose groups with the controls, for liver
adenoma and/or carcinoma tumors combined.
Ref: MEMORANDUM. November 8, 2001. SUBJECT:
REVISED Sodium Salt of Aciflourfen (Tackle TM , Blazer TM ) Quantitative
Risk Assessment (Q1 * ) Based On B6C3F1 Mouse Dietary Study Using
mg/kg b.w.^ 3 /4 's/day Cross Species Scaling Factor.
http://www.fluorideaction.org/pesticides/acifluorfen.na.cancer.nov01.pdf
Ammonium
bifluoride -
Wood Preservative - CAS
No. 1341-49-7
PubMed
Abstract: Male Wistar
rats were exposed to NH4F in concentration corresponding to mean
annual limit of fluoride compounds in the atmospheric air. After
3, 6 and 9 months a microsomal fraction was isolated from the
liver, and the composition as well as the metabolic activity of
this fraction was determined. The content of microsomal protein
increased after 3-month-long period of experiment, and subsequently
it dropped after the period of 9 months. The content of phospholipids
decreased after 3 months. The content of microsomal cholesterol
was particularly high after a 6-month-long experiment. There were
also changes in the contents of individual phospholipid fractions,
and fatty acids of phospholipids. The content of cytochrome P-450,
cytochrome b5 and activity of NADH-cytochrome b5 reductase did
not change. Activity of NADPH-dependent reductase of cytochrome
c--decreased after the period of 9 months. Moreover, as consequence
of changes in the activity of cytochrome P-450 system and the
endoplasmic reticulum composition, alterations were observed in
the metabolism of the tested substrates i.e. aniline and aminopyrine.
The aniline turnover was inhibited after 6 and that of aminopyrine
after 9 months experiment. The observed
changes may prove that the detoxication capacity of the liver
was impaired due to being exposed to ammonium fluoride.
Ref: Juzyszyn
Z (1991). [Chronic
effect of ammonium fluoride on selected parameters of microsomal
fracture of the rat liver with special reference to the cytochrome
P-450 system].
Ann Acad Med Stetin. 1991;37:49-64.
Benfluralin
(Benefin) - Herbicide - CAS
No. 1861-40-1
"Benefin: 13-Week Oral
Toxicity Study in Beagle Dogs", (D.W. Dalgard, Hazleton Washington,
HWA 174-135, 12/28/93). Benefin, purity 95.8%, administered via
capsule at concentrations of 0, 5, 25, 125 mg/kg/day to 4 Beagle
dogs/sex/group for 13 weeks. Emesis (compound colored) was slightly
increased at all dose levels for females and for mid and high
dose males. Liver weights was increased
for high dose males; and the incidence of
hepatocellular hypertrophy was increased for high dose
males and females. Increased incidence of hemosiderin pigment
was observed in the liver at the
high dose and the spleen at mid and high dose levels. NOAEL =
5 mg/kg/day. Acceptable (Kishiyama, J., and P. Iyer, 5/12/98).
Ref: Summary of Toxicology Data for Benefin.
California EPA, Department of Pesticide Regulation, Medical Toxicology
Branch
http://www.cdpr.ca.gov/docs/toxsums/pdfs/53.pdf
COMBINED, RAT **208-079
167288, :Benefin: Two-Year Dietary Chronic Toxicity/Oncogenicity
Study in Fischer 344 Rats", (Michael R. Moore, Corning Hazleton
Inc, Vienna, VA., Laboratory ID # CHV 174-133, Sponsor Report
# DR-0097-3397-005, 1 July 1996). Fifty CDF ¨ (F-344)CrlBR rats
per sex per group received benefin in the diet at 0, 10, 100,
2500, and 5000 ppm for 2 yr. An additional 10 per sex per group
at the same dose levels were designated for 1-yr interim sacrifice.
Estimated achieved dosages were 0, 0.5, 5.4, 136, and 275 mg/kg/day
in males, and 0, 0.7, 6.8, 168, and 331 mg/kg/day in females,
respectively over weeks 1-104. Chronic NOEL = 10 ppm (0.5 and
0.7 mg/kg/day in M and F), based on increased
hyaline droplets in kidneys of both sexes at 100 ppm and above,
increased and tubular cell karyomegaly and transitional cell hyperplasia
in kidneys of males, hepatocellular
hypertrophy and increased hepatocellular pigmentation in females,
and calculus of renal pelvis in females. Substantial toxicity
prompted investigators to determine that the two highest dose
levels "exceeded the maximum tolerated dose and therefore
should not be used for risk assessment". The study design,
with no dose levels between 100 and 2500 ppm, gave no opportunity
to characterize dose-response in this range of primary interest.
These were major changes at the highest two dose levels (in both
sexes, unless indicated), in addition to the findings for the
NOEL (above) applying to both sexes. Body weights were reduced
over time (in males, primarily in last few weeks of the study),
so that at termination the deficits of 2500 and 5000 ppm groups
compared to controls were 8 and 17% in males, and 18 and 28% in
females, respectively. In females only, this was accompanied by
approximately 10% food consumption reductions at each of the higher
dose levels. There were reductions in the main hematology parameters
(RBC counts, HCT, and Hb levels). Incidence and/or degree of chronic
progressive nephropathy was increased. The majority of these rats
had "slight" to "minimal" degeneration of
sciatic nerve and skeletal muscle (thigh). Males
had elevated incidence of single cell necrosis in liver. Chronic
inflammation of the lungs was seen in the majority of these rats,
whereas low incidences of congestion of the abdominal cavity,
and urinary bladder hyperplasia were limited to these dose levels.
Numerous clinical chemistry changes mirrored the above pathology
in kidneys,
liver, and perhaps other tissues at the higher two dose
levels. Tumor incidence: thyroid follicular tumors (adenomas and
carcinomas) increased in males (incidences of 1, 1, 1, 7, and
8 in controls through high dose, respectively) and females (incidences
of 0, 0, 1, 5, and 4). Hepatocellular tumors
(primarily adenomas) were increased in males (incidences
of 2, 2, 1, 5, and 11 in controls through high dose, respectively).
There were no statistically significant increases in epithelial
cell tumors in kidneys nor urinary bladder, however the low incidences
of transitional cell papilloma and tubule cell adenoma or carcinoma
were predominantly found in 2500 and 5000 ppm groups (compare
to the congener, trifluralin). Study is acceptable. Tumors are
possible adverse effects, which should be evaluated in perspective
of the many indications of excessive exposures at effective dose
levels. Green and Aldous, 4/11/00.
Ref:
Summary of Toxicological Data: Benefin. California EPA, Department
of Pesticide Regulation, Medical Toxicology Branch. Revised April
21, 2000.
http://www.fluorideaction.org/pesticides/benefin.ca.tox.rev.apr.2000.pdf
Benthiavalicarb-isopropyl
- Fungicide -
CAS
No. 177406-68-7
• In a 2-generation reproduction
study in Sprague Dawley rats receiving
0, 100, 1,000 or 10,000 ppm benthiavalicarb-isopropyl in the diet,
the parental noobserved adverse effect level (NOAEL) was 100 ppm
based on hepatocyte hypertrophy at
the next higher dose level. The reproductive NOAEL was 10,000
ppm.
• In a developmental toxicity study
in New Zealand White rabbits
receiving 0, 10, 20 or 40 mg/kg/day benthiavalicarb-isopropyl
from day 6 to 28 of gestation, the maternal
NOAEL was 20 mg/kg/day based on abortion
and increased liver weights at the 40 mg/kg/day dose.
• In a developmental
toxicity study in Sprague Dawley rats
receiving 0, 10, 100 or 1,000 mg/kg/day from day 7 to day 19 of
gestation, the maternal
NOAEL was 10 mg/kg/day based on elevated liver and adrenal
weights at 100 mg/kg/day.
The NOAEL for developmental toxicity was 1,000 mg/kg/day.
• In the 13-week feeding study with
mice, the dose levels were 0, 50, 200, 7,000, or 20,000
ppm. The NOAEL was 200 ppm (equivalent to 33.0 mg/kg/day and 45.2
mg/kg/day in males and females, respectively, based on
systemic toxicity of decreased body weights,
anemias, and generalized liver toxicity at
7,000 ppm.
• In the 3 month dog
feeding study the dose levels were 0, 40, 200, or 1,000
mg/kg/day. The NOAEL was 40 mg/kg/day based on hematological
and clinical chemistry changes, organ weight changes and the findings
of hepatocyte hypertrophy and
pigmentation in the spleen at 200 mg/kg/day.
.•
In a chronic/oncogenicity study Fisher rats
received 0, 50, 200, 5,000, or 10,000 ppm of benthiavalicarb-
isopropyl for up to 104 weeks. The NOAEL was 200 ppm (9.9 mg/kg/day
and 12.5 mg/kg/day in males and females respectively), based
on a variety
of toxic effects, primarily in the liver and kidney,
and adenocarcinomas of the uterus at
5,000 ppm.
• In an oncogenicity
study in mice, the dietary doses were 0, 20, 100, 2,500
or 5,000 ppm. The NOAEL was 100 ppm (13.7 mg/kg/day and 18.6 mg/kg/day
in males and females, respectively) based on
a variety of toxic effects, primarily in the liver and kidney,
and hepatocellular blastoma and carcinoma at
2,500 ppm.
• In a 52-week study
with Beagle dogs, the dietary dose levels were 0, 4, 40,
or 400 mg/kg/day. The NOAEL was 40 mg/kg/day based on increased
liver weights in males and females at 400
mg/kg/day.
• Numerous supplemental mechanistic studies
in the rodent were carried out to further elucidate the mechanisms
involved in tumor formation in the lifetime rodent studies.
These studies indicated that benthiavalicarb-isopropyl behaves
like a promotor following initiation with diethylnitrosamine (DEN),
and does not have initiating activity. The compound did
not cause oxidative damage in studies on rat or mouse liver, was
a slight enzyme inducer, and did not cause hepatocyte proliferation.
Ref: March 9, 2005. Petition
for the establishment of Tolerances on Imported Grapes and Tomatoes.
Federal Register: March 9, 2005.
Benzotrifluoride
- (also known as Trifluoromethylbenzene)
- Insecticide - CAS No.
98-08-8
-- Trifluoromethylbenzene
was studied for oral toxicity in Crj:CD (SD) rats in an OECD combined
repeat dose and reproductive/developmental toxicity screening
test at doses of 0, 20, 100 and 500 mg/kg/day. With regard to
repeated dose toxicity, effects on liver
and kidney were observed in both
sexes given more than 100 mg/kg, indicating a NOEL is of 20 mg/kg/day
for both sexes...
-- Test Results: ... As necropsy findings,
renal hypertrophy and discoloration were observed in males of
the 500 mg/kg group. Increase kidney weights
in males given more than 100
mg/kg and in females of the 500 mg/kg group, and increased liver
weights in males given more than 100 mg/kg were observed.
On histopathological examination, centrilobular
hepatocyte hypertrophy in both sexes, and hyaline droplets,
necrosis, basophilic change and dilatation of renal
proximal tubules in males were noted in the 100 and 500
mg/kg groups. Therefore, the NOEL is considered to be 20 mg/kg/day
for both sexes.
Ref:
1988. GINC: Global Information Network on Chemicals. The Databases
of Chemicals.
http://www.fluorideaction.org/pesticides/benzotrifluoride.toxicity.htm
Bifenthrin
- Acaricide, Insecticide - CAS Numbers:
82657-04-3 (Cis); 83322-02-5 (Trans)
A chronic/carcinogenicity
study in mice
fed at doses of 0, 50, 200, 500, or 600 ppm (0, 2.5, 10, 25, or
30 mg/kg/day) in the diet for 87 weeks (males) or 92 weeks (females).
Chronic LOEL is 10 mg/kg/day based on the incidence of tremors
in both sexes. Chronic NOEL is 2.5 mg/kg/day. Carcinogenic potential
was evidenced by a statistically significant increased trend for
hemangiopericytomas in the urinary bladders of males, a
significant dose-related trend for combined hepatocellular adenomas
and carcinomas in males, and a significantly higher incidence
of combined lung adenomas and carcinomas in females.
Ref: Federal Register: November 26, 1997.
Bifenthrin; Pesticide Tolerances. Final Rule.
http://www.fluoridealert.org/pesticides/Bifenthrin.FR.Nov.1997.htm
-- Category C (possible
human) carcinogen, primarily on the basis of the mouse carcinogenicity
study in which the high-dose males (81.3 mg/kg/day) showed a highly
significant increased incidence of urinary bladder tumors. Other
findings in the mouse study included a dose-related
trend of increased combined incidences of adenoma and adenocarcinoma
of the liver (males only), and increased incidences of
bronchioalveolar adenomas and adenocarcinomas of the lung in females
at some, but not all, doses relative to their controls.
Ref. Federal Register. April 30, 2003. Bifenthrin;
Pesticide Tolerance.
http://www.fluorideaction.org/pesticides/bifenthrin.fr.apr.30.2003.htm
Butafenacil -
Herbicide - CAS No. 134605-64-4
-- The most susceptible
species in long term studies was the mouse. A NOEL for butafenacil-allyl
of 0.36 mg/kg bw/day was found for males in an 18 month study,
essentially based on haematological effects mostly in males and
liver toxicity in animals of both
sexes. A rat 2-year study revealed a NOEL of 1.14 mg/kg bw/day
for males, based on liver toxicity
in animals of both sexes. A safety factor of 100 is considered
appropriate for the ADI, due to the extensive toxicology database
for butafenacil-allyl. This results in an ADI of 0.004 mg/kg bw/day
(p 10).
Long-Term Studies. Mice received butafenacil in the diet at concentrations
of 0, 1, 3, 10 and 60 ppm over 18 months. Haematological effects
included lower mean values for erythrocyte count, haemoglobin
concentration and haematocrit in males at 60 ppm at weeks 53 and
79, respectively, and for erythrocyte count, haemoglobin and haematocrit
at week 79 in males at 10 ppm. Males also had slightly increased
neutrophil and monocyte counts at 60 ppm, and a slight thrombocytosis.
Mean absolute and relative liver
weights were increased in both sexes at 60 ppm. The incidence
of enlarged liver was increased in
males at 60 ppm and in females at 10 and 60 ppm. Microscopic examination
revealed an increased incidence of hepatocyte
necrosis and hyperplasia of Kupffer cells in the liver
of males at 10 and 60 ppm, and of females at 60 ppm. In addition,
an increased incidence of lipofuscin deposition, and inflammatory
cell infiltration was seen in males at 60 ppm. There was no treatment-related
increase in the incidence of neoplasms at any dose. Butafenacil
was not carcinogenic in mice. The NOEL was 3 ppm in males and
10 ppm in females, equivalent to 0.36 and 1.20 mg/kg bw/day for
males and females, respectively (p7-8).... Rats were administered
butafenacil in the diet at doses of 0, 10, 30, 100 and 300 ppm
for 24 months. At interim sacrifice, the incidence
and/or severity of liver necrosis was increased in both sexes
at 100 and 300 ppm. In addition, increased incidence of
hepatocellular single cell necrosis (300 ppm) and increased incidence
(100 and 300 ppm) and severity (300 ppm) of cholangiofibrosis
were noted in females. At the end of the study, higher incidences
and slightly increased severity of fatty change in the
liver, and slightly higher incidences of increased mitotic
activity of hepatocytes were observed in females at 300 ppm. There
was no treatment-related increase in the incidence of neoplasms
at any dose. Butafenacil was not carcinogenic in rats. The NOEL
was 30 ppm, equivalent to 1.14 mg/kg bw/day for males and 1.30
mg/kg bw/day in females, respectively... Butafenacil was administered
to rats in the diet at concentrations of 0, 100, 300 and 1,000
ppm for a period of 90 days. Observations and functional tests
conducted during the Functional Observation Battery did not show
any effects of toxicological significance. No morphological changes
in the central or peripheral nervous system were revealed at neuropathological
examination. Microscopic examination of the
liver showed inflammatory cell infiltration, cholangiofibrosis
of the intrahepatic bile ducts, pigments within Kupffer
cells, necrosis of single hepatocytes, cytoplasmic vacuolation,
hypertrophy of centrilobular hepatocytes, and an increased mitotic
activity of hepatocytes of males at 1,000 ppm. Slight effects
were seen at 300 ppm, indicating the beginning of liver
necrosis.
Ref: Public Release Summary on Evaluation
of the new active BUTAFENACIL in the products LOGRAN B-POWER HERBICIDE
& TOUCHDOWN B-POWER HERBICIDE. National Registration Authority
for Agricultural and Veterinary Chemicals. Australia. February
2002.
http://www.nra.gov.au/publications/prsbuta.pdf
Some excerpts from Table 2.--Subchronic,
Chronic, and Other Toxicity
Ref: Butafenacil;
Pesticide Tolerance. Final Rule.
Federal Register. September 19, 2003.
http://www.fluorideaction.org/pesticides/butafenacil.fr.sept.19.2003.htm
|
Study
type
[Guideline number] |
Results |
90-Day
oral (dietary) toxicity rodents
(rat) - [870.3100] |
NOAEL
= 300 ppm (18.8/20.6 mg/kg/ day M/F). LOAEL = 1,000 ppm (62.3/69.3
mg/kg/ day M/F) based on decreased body
weight gains, decreased hemoglobin, hematocrit, mean corpuscular
hemoglobin (MCH), mean corpuscular volume (MCV), increased red
cell volume, increased bone marrow hypercellularity;
increased bilirubin and urobilinogen; increased alanine aminotransferase;
hepatocyte necrosis; inflammatory
liver cell infiltration |
90-Day oral (dietary) toxicity in rodents (mouse)
- [870.3100] |
NOAEL
= 30 ppm (4.11/5.67 mg/kg/day M/F) LOAEL = 100 ppm (13.8/20.1
mg/kg/ day M/F), based on hepatic histopathology:
fatty change, glycogen deposition, and hypertrophy in both sexes |
90-Day
oral (capsule) toxicity in non- rodents (dog)
- [870.3150] |
NOAEL
= 200 mg/kg/ day M/F LOAEL = 1,000 mg/kg/ day M/F, based on
decreases in MCV and MCH in males; increases in RDW, HDW, platelets
and triglycerides in males; and hemosiderosis
in spleen and liver
and extramedullary hematopoiesis the spleen in males |
1-Year chronic oral (capsule) toxicity
(dog) - [870.4100] |
NOAEL = 500 mg/kg/day M/F LOAEL = 1,000 mg/kg/ day M/F, based
on decreased body weight gain in males,
decreased MCV, MCH, and mean corpuscular hemoglobin concentration
(MCHC); increased thrombocytes and red cell volume distribution
width; hepatic histopathology:
glycogen disposition, inclusion bodies in cytoplasm, and pigment
disposition in both sexes, and focal
vaculolation [liver]
in females |
18-Month
carcinogenicity dietary study
(mouse) - [870.4200] |
NOAEL
= 10 ppm (1.17/1.20 mg/kg/day M/F) LOAEL = 60 ppm (6.96/ 6.59
mg/kg/day M/ F), based on enlarged livers
with increased weights, and hepatic microscopic lesions including
Kupffer cell hyperplasia, inflammatory cell infiltration, and
single cell necrosis in both sexes and on deposits of lipofuscin
in males No evidence of carcinogenicity |
Combined
2-Year chronic/ carcinogenicity dietary study
(rat) - [870.4300] |
NOAEL = 100 ppm (3.76/4.43 mg/kg/ day M/F) LOAEL = 300 ppm (11.4/13.0
mg/kg/ day M/F), based on minimal hepatic
abnormalities in the females, including a fatty change
and increased mitotic activity No evidence of carcinogenicity |
Mechanistic studies - [870.7485]
|
Effects
on enzymes of cultured mouse, rat, and/or human hepatocytes
involved with heme biosynthesis |
Effects
on liver microsomal and plasma
protox activity and its metabolic conversion |
Effects on porphyrin profile in rats; treatment induced porphyria,
consisting of accumulation of selected porphyrins in the liver,
spleen, and plasma and increased excretion in urine and feces |
Test
substance interferes with heme biosynthesis
in rats, as evidenced by dose- dependent, pronounced porphyria
in the liver,
spleen, and plasma; increased porphyrin excretion, and
decreased activity of various isoenzymes of the hepatic microsomal
cytochrome P450 system |
Some
excerpts from Table 3.--Toxicological Dose and Endpoints for
Butafenacil
- a summary of the toxicological endpoints used for human risk
assessment
Ref: Butafenacil; Pesticide Tolerance.
Final Rule. Federal Register. September
19, 2003.
http://www.fluorideaction.org/pesticides/butafenacil.fr.sept.19.2003.htm
|
-- Exposure Scenario
-- Dose Used in Risk Assessment, UF
-- Special FQPA SF* and Level of Concern
for Risk Assessment |
Study
and Toxicological Effects |
--
Chronic dietary (All populations)
-- NOAEL= 1.2 mg/kg/day UF = 100
-- Chronic RfD = 0.012 mg/ kg/day.
-- Special FQPA SF = 1 cPAD = chronic
RfD
-- Special FQPA SF = 0.012 mg/kg/day.
-- Long-term
inhalation (>6 months)
-- Oral NOAEL = 1.2 mg/kg/day
-- Residential
LOC for MOE = 100
-- Occupational = 100 |
Mouse
oncogenicity study.
The LOAEL is 6.96 mg/kg/. day, based on enlarged
livers with increased weights,
and hepatic microscopic lesions including Kupffer
cell hyperplasia, inflammatory cell infiltration, and
single cell necrosis in both sexes and on deposits of lipofuscin
in males |
Carfentrazone-ethyl
-
Herbicide
- CAS No. 128639-02-1
-- A 2-year
rat chronic toxicity/carcinogenicity study was conducted
in rats at intake levels of 0, 2, 9, 37 and 188 mg/kg/day for
males and 0, 3, 12, 49 and 242 mg/kg/day for females. The study
found the compound to be noncarcinogenic to rats under the conditions
of the study. The no-observed- effect level (NOEL) was 200 ppm
(9 mg/kg/day ) for males and 50 ppm (3 mg/kg/day) for females
respectively and the lowest-observed-effect-level (LOEL) was 800
ppm (37 mg/kg/day) for males and 200 ppm (12 mg/kg/day) for females,
based on liver histopathology and
total urinary porphyrin.
-- Chronic Toxicity. An 18-month mouse
carcinogenicity study was conducted in mice at dietary intake
doses of 0, 10, 110 and 1090 mg/kg/day for males and 0, 12, 119
and 1296 mg/kg/day for females). The study found the compound
to be noncarcinogenic to mice under the conditions of the study.
The systemic NOEL was 70 ppm (equivalent to 10 mg/kg/day for males
and 12 mg/kg/day for females), and the systemic LOEL was 700 ppm
(equivalent to 110 mg/kg/day for males and 119 mg/kg/day for females)
based on increased mortality and microscopic signs of
hepatotoxicity.
Ref: US EPA Pesticide Fact Sheet for Carfentrazone-ethyl.
September
30, 1998.
http://www.fluorideaction.org/pesticides/carfentrazone.epa.fact.1998.pdf
-- Subchronic oral
toxicity study in the dog. LOAEL
= 150 mg/kg/day based on decreased body weight gain and increased
porphyrin levels. -- -- Chronic toxicity study in rats. LOAEL
= 12 mg/kg/day based on liver histopathology
and increased urinary porphyrin levels.
Ref: Federal Register: June 12, 2002. Carfentrazone-ethyl;
Pesticide Tolerances for Emergency Exemptions. Final Rule.
http://www.fluoridealert.org/pesticides/Carfentrazone-E.FR.June2002.htm
--- Repeat-dose studies
indicate that the primary targets for carfentrazone-ethyl toxicity
are the liver, kidney,
and the red blood cell
forming system. Liver toxicity in all tested
species was characterised by increased liver weight, microscopic
changes in liver cells and increases in plasma levels of liver
enzymes...
--- NOEL/ADI The lowest overall NOEL for carfentrazone-ethyl was
3 mg/kg bw/day. This NOEL was established in the 2-year rat study,
based on pigment deposition, red fluorescence and histopathological
changes in the liver of rats at the
next highest dose. A safety factor of 100 is considered appropriate
for the ADI, due to the extensive, high quality toxicology database
for carfentrazone-ethyl. This results in an ADI of 0.03 mg/kg
bw/day.
Ref:
April 2000 - Australia. Evaluation of the new active CARFENTRAZONE-ETHYL
in the product AFFINITY 400 DF HERBICIDE. National Registration
Authority for Agricultural and Veterinary Chemicals. NRA Ref.
51555.
http://www.fluorideaction.org/pesticides/carfentrazone-e.aus.2000rpt.pdf
Also
available at http://www.apvma.gov.au/publications/prscar.pdf
Chlorfenapyr
-
Acaricide, Insecticide - CAS No. 122453-73-0
The 100-fold margin
of safety is adequate to assure a reasonable certainty of no harm
to infants and children from the proposed use. As stated earlier,
the NOAEL is based on the effects observed in the rat
and mouse chronic oncogenicity studies, (reduced bwt gains,
increased globulin and cholesterol values and
increased liver weights in the rat and reduced bwt gains
and vacuolation of white matter of the mouse brain)...
Ref: Federal Register: August 26, 1999 [Page
46677-46680]. Notice of Filing; Pesticide Petition.
http://www.fluoridealert.org/pesticides/Chlorfenapyr.FR.Aug.26.1999.htm
-- The no observed
adverse effect level from the 28-day dermal toxicity study of
100 mg/kg/day for short- and intermediate-term occupational or
residential risk assessments is based on increased cholesterol,
relative liver weights and cytoplasmic
vacuolation of the liver in male and females
rabbits at the lowest observed
adverse effect level of 400 mg/kg.
Ref: US EPA. Summary of Chlorfenapyr Risk
Benefit Assessment.
http://www.fluorideaction.org/chlor-summ.pdf
-- Subchronic Studies...
A 28-Day Rat Feeding Study", J.E.
Fischer; Non-guideline; Rat; American Cyanamid Company, Toxicology
Department, Princeton, NJ; Report No. T-0221; 8/30/91; AC 303,630
Technical (purity: 98.4%); 5 animals/sex/group; Doses: 0, 600,
900, 1200, 1600, 2000 ppm (males-0, 68.3, 106.3, 134.2, 176.8,
243.0 mg/kg/day, females-0, 71.6, 108.4, 138.5, 184.8, 245.5 mg/kg/day),
in the diet, 4 weeks... Necropsy: increased
absolute liver weight (M-1600, F-900, 1200,
1600, 2000 ppm)... Target organ: liver; NOEL: (M/F)
1200 ppm (based on increased SGPT activity, incidence of hepatocellular
hypertrophy and increased relative liver weight in 1600 ppm treatment
group); Study supplemental. (Moore, 1/30/95)
Ref: Summary of Toxicological Data for Chlorfenapyr.
California EPA. Department of Pesticide Regulation. Medical Toxicology
Branch. August 24, 2001.
http://www.fluorideaction.org/pesticides/chlorfenapyr.ca.epa.aug2001.pdf
-- MRID No. 42770219
(1993)-- 90-Day oral toxicity rats.
NOAEL = 24.1 mg/kg/day. LOAEL = 48.4, based on spongiform myelopathy
in the brain and spinal cord of male rats,
decreased body weight gain and increased relative liver weight
in males and females, increased
absolute liver weight in females, and
decreased hemoglobin in females.
- MRID No. 43492831 (1993). 21/28-Day dermal toxicity rabbit.
NOAEL = 100 mg/kg/day. LOAEL = 400 mg/kg/day, for both sexes,
based on changes in liver chemistry and
morphology.
-- Classification: ``Suggestive Evidence
of Carcinogenicity, but Not Sufficient to Assess Human Carcinogenic
Potential'' based on significant
trends in liver tumors (adenomas and combined adenomas/ carcinomas),
malignant histiocytic sarcomas, and testicular cell tumors in
male rats and uterine polyps in female rats seen at the highest
dose.
Ref:
Federal Register: September 26, 2003. Chlorfenapyr; Pesticide
Tolerance. Final Rule.
http://www.fluorideaction.org/pesticides/chlorfenapyr.fr.sept26.2003.htm
Chlorflurazole
- Herbicide
- CAS No. 3615-21-2
Animal Toxicity Studies:
Non-Human Toxicity Excerpts: ... AN UNCOUPLER OF OXIDATIVE PHOSPHORYLATION
CAUSING 50% UNCOUPLING OF RAT LIVER MITOCHONDRIAL
OXIDATIVE PHOSPHORYLATION AT 6X10-7 MOLAR ALSO STIMULATING
ATPASE ACTIVITY & CELL RESPIRATION. [Spencer, E. Y. Guide to the
Chemicals Used in Crop Protection. 7th ed. Publication 1093. Research
Institute, Agriculture Canada, Ottawa, Canada: Information Canada,
1982. 107]
Ref: TOXNET profile from Hazardous Substances
Data Bank for CHLOROFLUORAZOLE.
http://www.fluoridealert.org/pesticides/Chlorfluorazole.TOXNET.HSDB.htm
Chlorfluazuron
- Insecticide - CAS No. 71422-67-8
Abstract: [Chlorfluazuron,
71422- 67-8] was evaluated for reproductive toxicity. The
test material was administered at dietary concentrations of 0,
2000, or 10000 ppm to 11-13 male and 11-13 female CRJ:CD rats
per test group for 13 weeks before pairing and through 2 cycles
of mating, gestation, and lactation periods. Body weights of treated
animals were comparable to controls. A statistically
significant increase of liver/body weight ratio was seen in treated
females. A slight reduction was observed in parameters
of reproductive performance in the second (F1B) mating, including
mating index, fecundity index, and male
and female fertility index. A statistically
significant increase in fetal liver/body weight ratio was observed
at all treatment levels. No other parameters were examined.
Ref: 1992 - INITIAL SUBMISSION: IKI-7899: PRELIMINARY REPRODUCTION
STUDY IN RATS BY DIETARY ADMINISTRATION (FINAL REPORT) WITH COVER
LETTER DATED 03-27-92; from ISHIHARA SANGYO KAISHA LTD. Report
available from The National Technical Information Service; Order
No. NTIS/OTS0535939. EPA/OTS; Doc #88-920001555. [From Toxline
at Toxnet]
Chlorodifluoromethane
-
Insecticide, Fungicide, Propellant - CAS No. 75-45-6
Animal
Data - INHALATION: 4 hour, LC50, rat: 220,000 ppm. The
compound is a skin irritant and a slight eye irritant, but is
not a skin sensitizer in animals. Effects from single high exposures
include central nervous system depression,
anesthesia, rapid breathing, lung congestion and
microscopic liver changes...
Ref:
Material Safety Data
Sheet for Freon 22. DuPont. 1996.
CTFT:
Chlorotrifluorotoluene,
4-,Alpha,Alpha,Alpha- Intermediate used
in herbicides - CAS
No. 98-56-6
In 14-day toxicity
studies, 1 of 10 female rats given the top dose of 1000 mg/kg
CTFT in corn oil died on day 8; no deaths of male rats or of mice
of either sex were attributable to the administration of CTFT.
Body weight gains in all groups of rats and mice were similar
with the exception of the top dose (1000 mg/kg) groups of male
and female rats, which lost weight during the first week and resumed
weight gain during the second. CTFT was found to accumulate
in the kidneys of male rats, and there was a linear relationship
between the kidney CTFT concentrations and the kidney levels
of a2u-globulin, as determined by an ELISA assay. Microscopic
changes in male rats included a dose-related toxic nephropathy
consistent with that previously described as "hyaline droplet
nephropathy." Dosed male and female rats also had hepatocyte
hypertrophy and cytoplasmic vacuolization
of the adrenal cortex. Clinical pathology findings suggested
a mild anemia and cholestasis in rats. In contrast to rats, mice
did not show appreciable CTFT concentrations in any tissue evaluated,
suggesting a more rapid elimination of the chemical. However,
hepatocellular hypertrophy, and clinical
pathology findings consistent with cholestasis and mild liver
injury, were noted in mice in the 400 and 1000 mg/kg dose
groups. These studies demonstrated that oral doses of CTFT of
400 mg/kg or higher caused liver hypertrophy
in rats and mice and adrenal changes in rats. Doses of 50 mg/kg
or higher caused "hyaline droplet nephropathy" in male rats. The
results were similar with CTFT administered either in corn oil
or in -CD (although absorption of CTFT was somewhat more rapid
with -CD), suggesting that -CD may be an appropriate vehicle for
toxicity studies with other chemicals.
Ref: National Toxicology Program. July 1992.
Toxicity Studies of p-Chloro-,,Trifluorotoluene (CAS NO: 98-56-6)
Administered in Corn Oil and -Cyclodextrin to F344/N Rats and
B6C3F1 Mice in 14-Day Comparative Gavage Studies.
http://www.fluoridealert.org/pesticides/CTFT.NTP.ToxicityStudy.1992.htm
Clodinafop-propargyl
-
Herbicide - CAS No. 105512-06-9
Suggestive
Evidence of Carcinogenic Potential.
Prostate gland adenomas in male Tif:RAIf(SPF)
rats at the high dose only cannot be discounted; Peroxisome Proliferator-Activated
Receptor Agonism MOA for liver tumors
in mice.
Ref: April
26, 2006 . Chemicals Evaluated for Carcinogenic Potential by the
Office of Pesticide Programs. From: Jess Rowland, Chief Science
Information Management Branch Health Effect Division (7509C) Office
of Pesticide Programs, USEPA.
http://www.fluorideaction.org/pesticides/pesticides.cancer.potential.2006.pdf
-- Carcinogenicity.
In accordance with the EPA Proposed EPA Weight-of-the-Evidence
Categories, August 1999, the Agency's Cancer Assessment Review
Committee (CARC) classified clodinafop-propargyl as "likely
to be carcinogenic to humans" by the oral route based on
the occurrence of prostate tumors in male rats, ovarian tumors
in female rats, and liver tumors in both
sexes of mice, as well as blood vessel tumors in female
mice. For the quantification of human cancer risk, the CARC recommended
a linear low-dose extrapolation approach based on the most potent
of these tumor types. This approach is supported by possible genotoxic
potential and the lack of confirmation of the mode of action of
clodinafop-propargyl. The most potent unit risk, Q1 * (mg/kg/day)
-1 , of those calculated for clodinafop-propargyl is that for
male mouse liver benign hepatoma and/or
carcinoma combined tumor rates at 0.129 (mg/kg/day) -1 in human
equivalents.
SUBCHRONIC AND CHRONIC TOXICITY
-- 870.3100/ 28-Day Oral Gavage in Rats NOAEL < 5 mg/kg LOAEL
= 5 mg/kg for M and F based on liver toxicity
(enzyme changes),
-- 870.3100/ 13 Week Oral Toxicity in Rodent NOAEL = M: 0.9 mg/kg;
F: 8.2 mg/kg/day LOAEL = M: 120 ppm (8.2 mg/kg/day); F: 1000 ppm
(71.1 mg/kg/day) decreased body weight;
based on increased liver weights and enzymes
(AlPtase); decreased thymus weight
(atrophy). Reversed after 28 day recovery period.
-- 870.3100/ 13 Week Oral Toxicity in Mice NOAEL = M: 0.9mg/kg/day;
F: 1.1mg/kg/day LOAEL = M: 7.3 mg/kg/day ; F: 8.6 mg/kg/day based
on clinical chemistry; glucose, sodium, and chloride increases
and hepatocellular hypertrophy in males
and females.
-- 870.3200 28-Day Dermal Toxicity in Rats. Systemic NOAEL = 50
mg/kg/day Systemic LOAEL = 200 mg/kg based on dose-related increases
in liver weights and clinical signs
(piloerection and hunched posture) in male rats. Dermal NOAEL
= 1000 mg/kg/day.
-- 870.3800 Two Generation Rat Reproduction Study Parental/Systemic
NOAEL= 3.2 mg/kg/day. Parental/Systemic LOAEL = 31.7 mg/kg/day
based on decrease
in body weight gain, reduced food consumption,
increased
liver and kidney weights and histopathological changes in the
liver and renal tubules...
-- 870.4200b Carcinogenicity -Mice NOAEL = M: 1.10 mg/kg/day;
F: 1.25 mg/kg/day LOAEL =M: 11.0 mg/kg/day; F: 12.6 mg/kg/day
based on increase in liver enzyme activity
and liver weights. Under the conditions of this study,
clodinafop-propargyl induced hepatocellular
tumors at 29.6 mg/kg. The chemical was tested at doses
sufficient to measure its carcinogenic potential.
-- 870.4300 Chronic/ Oncogenicity in the Rat. NOAEL = M:0.03 mg/kg/day
; F: 0.03 mg/kg/day LOAEL = M: 0.3 mg/kg/day; F: 0.4 mg/kg/day
based on hepatocytic hypertrophy,
chronic progressive nephropathy,
and tubular pigmentation. Under the conditions of this study,
treatment with clodinafop-propargyl increased the incidence of
prostate and ovarian tumors in rats at 750 ppm. For males, an
increased incidence of prostate adenoma was seen in the high-dose
group. The chemical was administered at a dose sufficient
to test its carcinogenic potential.
-- Special Study: The Effect Of CGA 184927 On Selected Biochemical
Parameters In The Rat Liver. Following
Subchronic Administration. The effects of clodinafop-propargyl
on selected liver enzymes in the rat were similar to the effects
seen after subchronic treatment with known peroxisome proliferators
(hypolipidemic compounds, phenoxyacetic acid derivatives). Hence,
clodinafop-propargyl was considered to most
likely be a peroxisome proliferator in the rat liver.
-- Special Study: Trendelenburg, C. Effects on Selected Plasma
Concentrations and Biochemical Parameters in the Liver upon Subchronic
Administration to Male Adult Rats. Clodinafop-propargyl may act
as a peroxisomal proliferating agent and
alters monooxygenase activity in subfamilies of cytochrome P450
which are known to be involved in the synthesis or catabolism
of steroid hormones.
Ref: US EPA Pesticide Fact Sheet. Reason
for Issuance: Conditional Registration. June 6, 2000.
http://www.epa.gov/opprd001/factsheets/clodinafop.pdf
Dietary treatment of
rats with concentrations over 2 years resulted in initial inappetence
in males and reduced body weight development in both sexes treated
at 750 ppm. The main target organ of toxicity
was the liver. Changes in plasma protein and lipid levels,
strongly enhanced serum activities of liver
enzymes, increased liver weights,
and severe liver necroses were observed
at dietary doses of 300 and 750 ppm in males and at 750 ppm in
females. The degenerative lesions provide strong evidence that
these dose levels exceeded a maximum tolerated dose (MTD). Top
dose group males showed a higher incidence of prostate adenoma,
while prostate hyperplasia was reduced. However, the total incidence
of proliferative changes in the prostate remained unchanged indicating
a progression from prostate hyperplasia to adenoma. Females treated
at the same high dose had higher incidences of ovary tubular adenoma.
The slightly enhanced incidences of these lesions are likely a
consequence of the severe disturbance of the general metabolic
balance due to excessive liver toxicity.
In fact, male rats fed 750 ppm exhibited a marked increase in
peroxisomal oxidation, and an increase in cytochrome P450 4A1/
A3 and 4A2 in their livers. Further,
a decrease in cytochrome P450 isoenzymes including CYP 2A, CYP
3A, and male-specific CYP 2C11 was observed. The total oxidation
rate of testosterone, aromatase (CYP 19A1) activity plasma estradiol
concentration and plasma-- dihydrotestosterone are altered at
this level of treatment. Clodinafop- propargyl is a potent peroxisome
proliferator in the rat liver and
this peroxisomal prolifering activity manifests itself by altering
Cytochrome P450-dependent monooxygenses which are involved in
steroid hormone homeostasis. The NOAEL of 10 ppm was equivalent
to a mean daily dose of 0.32 mg/kg in males and 0.37 mg/kg in
females. The EPA HIARC concluded that based on hepatocellular
hypertrophy and kidney findings, the NOAEL was 1 ppm (0.031 in
males and 0.034 in females. Carcinogenicity. The EPA HIARC recommended,
based on the increased incidence of prostate and ovarian tumors
in rats and hepatocellular tumors in mice, that the Cancer Assessment
Review Committee review clodinafop-propargyl... The scientific
evidence available amply demonstrates that exposure to substances
that produce tumors by a peroxisome proliferator mode of action
does not represent a risk of tumor development in man. Novartis,
therefore, has concluded that clodinafop-propargyl is not a carcinogen
of relevance to humans.
Ref: Federal Register. April 26, 2000. [PF-938;
FRL-6554-2]
http://www.epa.gov/fedrgstr/EPA-PEST/2000/April/Day-26/p10432.htm
Cloransulam-methyl
- Herbicide - CAS No. 147150-35-4
-- In a 90-day mouse
feeding study the NOEL was 50 mg/kg/day males. In a 21-day rabbit
dermal study the dermal irritation NOEL was equal or greater than
1000 mg/kg/day and the systemic NOEL was equal to 500 mg/kg/day.
In a 1-year dog chronic feeding study the NOEL was 10 mg/kg/day
and the LOEL was 50 mg/kg/day based on hepatocellular
hypertrophy and accumulation of pigment, and increased
activity of alkaline phosphatase and alanine aminotransferase
liver enzymes and decrease in albumin and total bilirubin.
-- In the rat Chronic Feeding / Carcinogenicity study the NOEL
was equal to 75 mg/kg/day and the Lowest Observed Effect Level
(LOEL) was 325 mg/kg/day based on significant
increase in hemoglobin, hematocrit, and red cell count in males,
activities of the liver enzymes aspartate
and alanine aminotransferase as well as alkaline phosphatase were
decreased in males, cholesterol was
decreased in females, specific gravity of urine was decreased
in females, increased relative wight in liver
and relative weight of testes in males,
males exhibited an increased incidence of collecting duct hypertrophy
and females exhibited increased incidence of vacuolation in the
kidney. There was no evidence of carcinogenicity for cloransulam-methyl
in this study. In the mouse carcinogenicity study the NOEL was
10 mg/kg/day and the LOEL was 108 mg/kg/day based on based on
a decrease in renal tubule vacuolation in
male mice, increased size of centrilobular and midzonal hepatocytes
accompanied by altered tinctorial properties in females and centrilobular
hepatocyte hypertrophy in males. Total tumor incidence (adenoma
+ carcinoma) was not increased by dosing with cloransulam-methyl.
-- 90-day dietary (mice): NOEL = 50 mg/kg/day (males) LOEL = 100
mg/kg/day for males based on increased levels of alkaline phosphatase
and increased liver weights and an
increase in the size of hepatocytes.
-- 1 Year Chronic Feeding (dog): NOEL = 10 mg/kg/day LOEL = 50
mg/kg/day based on hepatocellular hypertrophy
and accumulation of pigment, and increased activity of alkaline
phosphatase and alanine aminotransferase liver
enzymes and decrease in albumin and total bilirubin.
-- Chronic Feeding/ Carcinogenicity (rat): NOEL = 75 mg/kg/day
LOEL = 325 mg/kg/day based on significant
increase in hemoglobin, hematocrit, and red cell count in males,
activities of the liver enzymes aspartate
and alanine aminotransferase as well as alkaline phosphatase were
decreased in males, cholesterol was decreased
in females, specific gravity of urine was decreased in
females, increased relative weight in liver
and relative weight of testes in males, males exhibited an increased
incidence of collecting duct hypertrophy and females exhibited
increased incidence of vacuolation in the kidney.
There was no
evidence of carcinogenicity for cloransulam-methyl in this study.
-- Carcinogenicity (mouse): NOEL = 10 mg/kg/day LOEL = 108 mg/kg/day
based on a decrease in renal tubule vacuolation
in male mice, increased size of centrilobular and midzonal
hepatocytes accompanied by altered tinctorial properties in females
and centrilobular hepatocyte hypertrophy
in males. Total tumor incidence (adenoma + carcinoma) was
not increased by dosing with cloransulam-methyl.
Ref: USEPA. Pesticide Fact sheet. Cloransulam-methyl.
Reason for Issuance: Conditional Registration Date Issued: October
29, 1997.
http://www.epa.gov/opprd001/factsheets/cloransulam.pdf
... Cloransulam-methyl
84% DF was not found to be carcinogenic, teratogenic or to cause
reproductive effects. In-vitro and animal mutagenicity studies
were negative. Target organ effects have
been reported in the blood, kidney, liver,
testes and thyroid gland...
Ref: Material Safety Data Sheet for Gauntlet
Herbicide. MSDS Ref. No: F18-20-2. Date Approved: 09/25/2000.
Revision No. 1. FMC Corporation, Agricultural Products Group,
1735 Market Street, Philadelphia, PA 19103, USA.
http://www.fluoridealert.org/pesticides/Gauntlet.HerbicideMSDS.2000.pdf.
Also available at http://www.cdms.net/ldat/mp48J001.pdf
Cyhalofop-butyl
- Herbicide
- CAS No. 122008-85-9
5. Subchronic and chronic
toxicity, and oncogenicity. Cyhalofop- butyl caused increases
in liver and kidney weights, microscopic
hepatocellular hypertrophy, renal
tubular microscopic effects, and distended gallbladders when given
at sufficiently high dose levels to the appropriate species for
13 weeks. Similar increases in liver and
kidney weights, hepatocellular hypertrophy, and renal effects
were also observed in chronic toxicity studies in rodents. In
addition, mice had liver inflammation (microgranulomas).
Chronic toxicity in dogs was limited to decreased body weight
and the occurrence of concretions in the gallbladder. Using the
Guidelines for Carcinogen Risk Assessment published September
24, 1986 (51 FR 33992), it is proposed that cyhalofop and cyhalofop-butyl
be classified as Group E for carcinogenicity (no evidence of carcinogenicity)
based on the results of carcinogenicity studies in two species.
Dow AgroSciences LLC believes that there was no evidence of carcinogenicity
in an 18-mouse feeding study and a 24-month rat feeding study
at all dosages tested.
Ref: Federal Register. April 25, 2001. [PF-1009;
FRL-6774-7]
http://www.fluoridealert.org/pesticides/Cyhalofop-butyl.FR.Apr.2001.htm
Cyhalothrin
- Acaricide, Insecticide - CAS No. 68085-85-8
Long term toxicity
and carcinogenicity Target / critical effect: Liver
Lowest relevant NOAEL: NOEL 1.7 mg/kg bw/d, 2 y rat (cyhalothrin)
Carcinogenicity: Negative
Ref:
European Commission. Review report for the active substance lambda-cyhalothrin.
Finalised in the Standing Committee on Plant Health at its meeting
on 19 October 2000 in view of the inclusion of lambda-cyhalothrin
in Annex I of Directive 91/414/EEC. 7572/VI/97-final. 25 January
2001.
http://europa.eu.int/comm/food/fs/ph_ps/pro/eva/existing/list1-24_en.pdf
Cyhalothrin,
lambda -
Insecticide - CAS No. 91465-08-6
--
Short term toxicity. Target / critical effect: Organs: Liver,
CNS. Lowest relevant oral NOAEL / NOEL: 0.5 mg/kg bw/d, oral,
1 y dog.
Ref: European Commission. Review report
for the active substance lambda-cyhalothrin. Finalised in the
Standing Committee on Plant Health at its meeting on 19 October
2000 in view of the inclusion of lambda-cyhalothrin in Annex I
of Directive 91/414/EEC. 7572/VI/97-final. 25 January 2001.
http://europa.eu.int/comm/food/fs/ph_ps/pro/eva/existing/list1-24_en.pdf
Dichlofluanid
- Wood
Preservative, Antifoulant, Fungicide, Acaricide -
CAS No. 1085-98-9
--
In the chronic
studies, the most consistent findings were
cranial osteosclerosis in the rat, and findings consistent with
fluorosis in a 2-year mouse study. Clinical chemistry findings
with supportive histopathology were observed in a 1-year study
in the dog which were indicative of
renal and liver damage. A
detailed assessment of cranial osteosclerosis
was performed in a 2-year study in the rat; a LOEL was
established at 10-14 mg kg -1 d -1..
-- A detailed assessment of cranial osteosclerosis was performed
in a rat 2-year study (summarised in section 3.3.5.1) in which
a LOEL was established at 10-14 mg kg -1 d -1 . A clear increase
in the incidence of cranial osteosclerosis was observed in the
low- and middle-dose groups, with almost all animals affected
at the top dose. These findings are likely to be secondary to
fluorosis in these animals. In terms of interspecies comparisons,
in a mouse 2- year study, thickening of both the appositional
bone of the cranial vault and nasal turbinates, and tooth alveolitis
were observed at the top dose of 1,731-1,873 mg kg -1 d -1 . These
findings are also considered to be a secondary consequence of
fluorosis in these animals. No evidence of fluorosis was observed
in the dog studies. It is considered that these findings are likely
to represent a fluoride mediated perturbation of bone metabolism
but are not considered to be of concern for human health.
It is considered that the observed liver and renal damage is of
concern to human health.
-- In a 1-year dog study clinical chemistry findings with supportive
histopathology, indicative of nephrotoxicity
and liver damage, were observed. In this study a NOAEL
of 2.5 mg kg -1 d -1 was established.
Ref:
January
2003 - Evaluation
on: Booster biocides in antifouling products. Full review of Dichlofluanid.
No. 206. Evaluation of Fully Approved or Provisionally Approved
Products. Prepared by : The Health and Safety Executive Biocides
& Pesticides Assessment Unit, Magdalen House, Stanley Precinct
Bootle Merseyside L20 3QZ Available from: Department for Environment,
Food and Rural Affairs, Pesticides Safety Directorate, Mallard
House, Kings Pool, 3 Peasholme Green, York YO1 7PX, UK.
Also available at:
http://www.pesticides.gov.uk/citizen/Evaluations/206_dichlofluanid.pdf
Dichlorodifluoromethane
- Insecticide, Fungicide Propellant, EPA List 2 Inert
- CAS No. 75-71-8
-- Pathologic liver
changes were reported in guinea pigs chronically exposed (continued
for 90 days; or eight hr daily, 5 days weekly, for six wk) to
F 12 at levels of about 4,000 mg/cu
m (0.08 % by vol). [USEPA; Ambient Water Quality Criteria Doc:
Halomethanes p.C-52-5 (1980) EPA 440/5-80-051]
-- Short-term inhalation studies have been reported for CFC-11,
CFC-12, CFC-112, CFC-113, CFC-114,
and CFC-115. The results showed low toxicity, and the effects
observed were related mainly to the CNS,
respiratory tract,
and the liver. Oral toxicity
studies have confirmed the low toxicity. [WHO; Environmental Health
Criteria 113: Fully Halogenated Chlorofluorocarbons p.18 (1990)]
Ref: TOXNET profile from Hazardous Substances
Data Bank for Dichlorodifluoromethane.
http://www.fluoridealert.org/pesticides/Dichlorodifluorometh.TOXNET.htm
Dichlorofluoromethane
(CFC-21)
- Propellant, EPA List 2 Inert - CAS
No. 75-43-4
--
Repeated exposures have produced marked
hepatic damage or failure. Ten rats exposed at 10,000 ppm
CFC-21, 6 hours per day, 5 days per week for 2 weeks, all survived,
but their livers were grossly pale and heavy. Histopathologic
examination showed centrilobular necrosis
with related changes. In comparable 90-day series of exposure
at 5000 and 1000 ppm levels, rats showed bilateral hair loss and
excessive mortality (20 of 54 died at 1000 ppm, 15 of 54 at 5000
ppm). Four dogs exposed at both levels showed weight loss. Cirrhosis
was evident in rats exposed at both
levels, but with dogs histopathologic changes in the liver were
mild and evident only at the 5000 ppm. [American
Conference of Governmental Industrial Hygienists, Inc. Documentation
of the Threshold Limit Values and Biological Exposure Indices.
6th ed. Volumes I,II, III. Cincinnati, OH: ACGIH, 1991. 434]**PEER
REVIEWED**
-- /GUINEA PIGS/ ... EXPOSED /UP TO 2 HR/ @ CONCN OF 10.2% DIED
&, ON AUTOPSY, CONGESTED LUNGS, CONGESTED KIDNEYS, CONGESTED
LIVER, DISCOLORED SPLEEN, & HIGHLY CONTRACTED HEART WERE
FOUND. [American Conference of Governmental
Industrial Hygienists. Documentation of the Threshold Limit Values
for Substances in Workroom Air. Third Edition, 1971. Cincinnati,
Ohio: AmericanConference of Governmental Industrial Hygienists,
1971. (Plus supplements to 1979) 81]**PEER REVIEWED**
-- TSCA Test Submissions: A subchronic inhalation toxicity study
was conducted with groups of male (35) and female (35) albino
rats (strain not reported) receiving whole body exposure to dichloromonofluoromethane
at a nominal concentration of 0, 50, 150 or 500ppm in a dynamic
air flow chamber for 6 hours per day, five days per week for approximately
90 days. On day 45 and day 90, 5 animals per sex and 20 animals
per sex, respectively were sacrificed. The remaining animals were
observed for an additional 30 days and then sacrificed. Four high
dose males were found dead during the exposure period and one
female and six males from the high dose group were found dead
during the recovery period. High dose rats were observed to have
statistically significant (p < 0.01) lower body weights than controls
during the exposure period, but were comparable after the 30 day
recovery period. Hematology, clinical chemistry and urine analysis
values were similar between all dosed animals and control animals,
with the exception of a slightly higher total blood leukocytes
counts and elevated mean SAP and SGPT values for high dose animals
at approximately 45, 90 and 120 days. A dose related increase
in urine fluoride levels was also observed. Histopathology evaluation
of treated animals revealed portal cirrhosis
of the liver, interstitial edema of the pancreas and degeneration
of the seminiferous epithelium [the
sperm producing part of the testicle - EC]. Three cases of leukemia
were observed in high dose male rats. [Industrial
Bio-Test Laboratories; Subacute Inhalation Toxicity
Study with Genetron 21 in Albino Rats, (1979), EPA Document No.
FYI-OTS-0779-0045, Fiche No. OTS0000045-0 ]
Ref: TOXNET profile from Hazardous Substances
Data Base for DICHLOROFLUOROMETHANE.
http://www.fluoridealert.org/pesticides/Dichlorofluoromethan.TOXNET.htm
Diclosulam
- Herbicide
- CAS No. 145701-21-9
Based on oral feeding
studies, the primary target organs are the
liver and kidney. In a subchronic rat feeding study, the
primary target organ is the liver
including increased relative organ weight, hepatocellular
hypertrophy, and slight multifocal necrosis. Decreased
body weight and kidney lesions were also noted. Liver
effects were also noted in a subchronic dog study and included
increased relative liver weight,
centrilobular hepatocellular changes, and hepatocellular necrosis
accompanied by elevated ALP, AST, and ALT.
Ref: Federal Register. March 8, 2000. Diclosulam;
Pesticide Tolerance. Final Rule.
http://www.fluoridealert.org/pesticides/Diclosulam.FR.March8.2000.htm
Diflubenzuron
-
Chemosterilant, Insecticide - CAS No. 35367-38-5
Chloroaniline,
p (or 4-chloraniline) is a metabolite of Diflubenzuron.
In 2006, USEPA classified chloroaniline, p as
a "Group B2 -- Probable Human Carcinogen." "Spleen
(fibrosarcomas,
hemangiosarcomas & osteosarcomas) (M); Adrenal
(pheochromocytomas (M & F); F344/N rats. Hepatocellular
adenomas/carcinomas (M); Hemangiosarcomas
in spleen and/or liver (M) in B6C3F1 mice."
Ref: April
26, 2006 . Chemicals Evaluated for Carcinogenic Potential by the
Office of Pesticide Programs. From: Jess Rowland, Chief Science
Information Management Branch Health Effect Division (7509C) Office
of Pesticide Programs, USEPA.
http://www.fluorideaction.org/pesticides/pesticides.cancer.potential.2006.pdf
At all dose levels,
histopathological examinations indicated dose related increases
of hemosiderosis and congestion of the spleen, hemosiderosis and
chronic hepatitis of the liver, and mild erythroid hyperplasia
of the bone marrow... Male rats at 6 and 18 mg/kg/day and female
rats at 18 mg/kg/day had blue extremities indicative of cyanosis.
Histopathological examinations indicated non-neoplastic treatment-related
effects in the spleen, liver, bone
marrow and adrenal gland... (National Toxicology Program (NTP)
Report No. 351; July, 1989)..."
Ref: US EPA RED. August 1997.
http://www.fluoridealert.org/pesticides/Diflubenzuron.RED.pdf
-- Chronic toxicity.
Diflubenzuron was given by capsule to male and female Beagle dogs
for 1 year at dose levels of 0, 2, 10, 50, and 250 mg/kg/day.
Body weight (bwt) gain was slightly reduced in females at 250
mg/kg/day. Absolute liver and spleen weights were increased in
males given 50 and 250 mg/kg/day. A reduction
in hemoglobin and mean corpuscular hemoglobin concentration, with
an elevation in reticulocyte count, was seen at 50 and 250 mg/kg/day.
Methemoglobin and sulfhemoglobin values were increased at doses
of 10 mg/kg/day and greater. Histopathological findings
were limited to pigmented macrophages and
Kupffer cells in the liver at doses of 50 and 250 mg/ kg/day.
The NOAEL for chronic toxicity in dogs was 2 mg/kg/day.
-- A 91-week carcinogenicity study in CFLP mice was conducted
at doses of 0, 16, 80, 400, 2,000, and 10,000 ppm. There was no
increase in tumor incidence as a result of diflubenzuron administration.
Target organ effects included: Increased
methemoglobin and sulfhemoglobin values, Heinz bodies,
increased liver and spleen weight,
hepatocyte enlargement, and vacuolation,
extramedullary hemopoiesis in the liver and
spleen, siderocytosis in the spleen and
pigmented Kupffer cells. A NOAEL
for these effects was 16 ppm (2 mg/kg/day).
-- Diflubenzuron was fed to male and female Sprague Dawley rats
for 2 years at dose levels of 0, 156, 625, 2,500, and 10,000 ppm.
Methemoglobin values were elevated in female
rats at all dose levels and in male rats at the two highest dose
levels. Blood sulfhemoglobin was elevated in females, only, at
dose levels of 2,500, and 10,000 ppm. MCV and reticulocyte counts
were increased in high dose females. Spleen and liver
weights were elevated at the two highest doses. Histopathological
examination demonstrated an increase in hemosiderosis
of the liver and spleen, bone marrow
and erythroid hyperplasia, and areas of cellular alteration
in the liver. There was no increase
in tumor formation...
-- PCA [p-chloroaniline; a metabolite of
Diflubenzuron] hydrochloride was administered 5 days/week
by oral gavage to male and female B6C3F1 mice at doses of 0, 3,
10, or 30 mg/kg/day. Mean body weights of high dose male and female
mice were generally within 5% of those of controls throughout
the study. The incidence of hepatocellular
adenomas or carcinomas (combined) was increased in a non-dose-dependent
manner in treated male mice. Metastasis
of carcinoma to the lung was seen in the high dose group. An
increased incidence of hemangiosarcomas of the liver or spleen
was seen in high dose male mice. It was concluded that,
under the conditions of this 2-year gavage study, there was some
evidence of carcinogenic activity of PCA hydrochloride for male
B6C3F1 mice and no evidence of carcinogenic activity of PCA hydrochloride
for female B6C3F1 mice.
Ref: Federal Register: December 14, 2001.
(Volume 66, Number 241)] [Notices] [Page 64823-64828]. Notice
of Filing Pesticide Petitions to Establish a Tolerance for a Certain
Pesticide Chemical in or on Food.
http://www.fluoridealert.org/pesticides/Diflubenzuron.FR.Dec14.2001.htm
Abstract: Diflubenzuron
(DFB), a potent inhibitor of insect chitin synthesis, was administered
to Swiss Webster mice in a 30-day oral intubation study. Animal
groups received either no treatment, vehicle control (Polyethylene
glycol 400), or DFB suspensions at doses of 125, 500, and 2,000
mg/kg body weight. Hepatic glutathione S-transferase activity
as well as morphological characteristics were studied. DFB
was shown to elicit hepatocellular changes at all dose levels.
The activities of three glutathione S-transferases
(S-aryl, S-aralkyl, and S-epoxide) were all altered after DFB
administration. Light microscopy revealed radial arrays
of hepatocellular vacuolization between
the portal and central vein areas. Electron-microscopic examination,
verified by morphometric analysis, revealed degenerative
changes as well as an increased volume density of the endoplasmic
reticulum.
Ref:
J Appl Toxicol. 1986 Oct;6(5):343-8. Effects
of diflubenzuron on the mouse liver. Young MF, Trombetta LD,
Carson S.
Diflufenican
- Herbicide - CAS No. 83164-33-4
-- Subchronic/chronic
toxicity studies... The NOAEL in the 104-week mouse study was
500 ppm (approximately 60 - 70 mg/kg bw/day) based on minimal
reduction in body weight gain at the 500 ppm dose level and significant
reduction in body weight gain and increase in the absolute and
relative liver weight in females
at the higher dose level. Diflufenican was not tumourigenic in
the mouse. The NOEL in the 52-week oral study in the dog was 100
mg/kg bw/day based on significant increase in liver
weight at the higher dose level.
Ref: September
1995. Evaluation on Diflufenican.
Evaluation of fully approved or provisionally approved products.
Department for Environment, Food and Rural Affairs, Pesticides
Safety Directorate, Mallard House, Kings Pool, 3 Peasholme Green,
York YO1 7PX, UK. Available at:
http://www.pesticides.gov.uk/citizen/evaluations/evallist_alphabet.htm
Dithiopyr
- Herbicide -
CAS No. 97886-45-8
... In a 13-week dog
feeding study, increased alkaline phosphatase, discolored livers,
and cholestasis was observed at 10
mg/kg/day (LOEL). The NOEL was 1 mg/kg/day. In addition, at 30
mg/kg/day, increased serum glutamic-pyruvic transaminase and serum
glutamic oxaloacetic transaminase, increased liver
and kidney weights, and decreased cholesterol and albumin were
observed. EPA believes that there is sufficient evidence for listing
dithiopyr on EPCRA section 313 pursuant to EPCRA section 313(d)(2)(B)
based on the available hepatic and
renal toxicity data.
Ref:
USEPA/OPP. Support Document for the Addition of Chemicals from
Federal Insecticide, Fungicide, Rodenticide Act (FIFRA) Active
Ingredients to EPCRA Section 313. U. S. Environmental Protection
Agency, Washington, DC (1993). As cited by US EPA in: Federal
Register: January 12, 1994. Part IV. 40 CFR Part 372. Addition
of Certain Chemicals; Toxic Chemical Release Reporting; Community
Right-to-Know; Proposed Rule.
The following results
were presented by a Monsanto scientist.
-- Four-week Feeding Study in Mice. Dithiopyr
was administered via the diet to groups of 6 male and 6 female
CD-1 mice for 4 weeks at concentrations of 0, 300, 1000, 3000,
10,000 and 30,000 ppm... Liver enlargement
and discoloration, adrenal enlargement, and atrophy of
the thymus, spleen, seminal vesicles, ovaries and uterus were
noted on gross post-mortem examination... (The Institute of Environmental
Toxicology, 1987)
-- Thirteen-week Feeding Study in Mice Dithiopyr was administered
via the diet to groups of 12 male and 12 female CD-1 mice for
13 weeks at concentrations of 0, 10, 100, 1000 and 5000 ppm. Mortality,
decreased body weight gain, reduced feed efficiency, and mild
anemia were observed at the higher dose level. By study termination
many high dose animals appeared jaundiced, emaciated and had distended
abdomens. Postmortem examination revealed primarily liver
and kidney toxicity. Elevated plasma AP, alanine aminotransferase
(ALT), aspartate aminotransferase (AST), urea nitrogen and cholesterol
levels were indicative of cholestasis and liver
toxicity. These biochemical changes were accompanied by a significant
increase in liver weight, hepatocellular
swelling, vacuolation and necrosis, dissociation of hepatocellular
cords, and bile duct proliferation... The subchronic NOEL in mice
is considered to be 10 ppm. (The Institute of Environmental Toxicology,
1989)
-- Two-week Oral Study in Dogs ¥Dithiopyr was administered orally
via gelatin capsule to 1 male and 1 female beagle dog for 2 weeks
at dose levels of 0, 10, 30, 60, 100 and 200 mg/kg/day. Emesis
and decreased body weight were observed at the higher dose levels.
Biochemical and histopathological evidence of liver
toxicity, manifest as increased AP, AST, and g-GT levels in plasma,
along with hepatocellular swelling, pigment deposition, and focal
necrosis, were apparent on postmortem examination. The NOEL is
considered to be 10 mg/kg/day. (The Institute of Environmental
Toxicology, 1988)
-- Thirteen-week Oral Study in Dogs ¥Dithiopyr was administered
orally via gelatin capsule to groups of 6 male and 6 female beagle
dogs for 13 weeks at dose levels of 0, 1, 10 and 30 mg/kg/day.
Postmortem examination revealed liver
toxicity and moderate to severe cholestasis
at the higher dose levels. Specific findings included : increased
liver weights, increased AP, AST and g-GT levels in plasma, along
with liver swelling, distended gallbladders with sandy stones,
pigment deposition in bile canaliculi and Kupffer cells, and mononuclear
cell infiltration of the liver. The
subchronic NOEL in dogs is considered to be 1 mg/kg/day. (The
Institute of Environmental Toxicology, 1988)
-- Eighteen-month Feeding Study in Mice ¥In an oncogenicity study,
dithiopyr was administered via the diet to groups of 70 male and
70 female CD-1 mice for 78 weeks at concentrations of 0, 3, 30
and 300 ppm... Postmortem examination revealed primarily
liver toxicity. There were no statistically significant
or biologically significant increases in neoplastic lesions. ¥Liver
enlargement and discoloration, hepatocellular swelling,
bile duct proliferation, and pigment deposition in hepatocytes,
Kupffer cells and the bile canaliculi were indicative of mild
liver toxicity and cholestasis... The chronic NOEL in mice
is considered to be 3 ppm (equivalent to a daily intake of 0.31
mg/kg b.w. in males and 0.37 mg/kg b.w. in females). (The Institute
of Environmental Toxicology, 1989)
-- Twelve-month Oral Study in Dogs ¥Dithiopyr was administered
orally via gelatin capsule to groups of 6 male and 6 female beagle
dogs for 52 weeks at dose levels of 0, 0.5, 5 and 25 mg/kg/day...
Postmortem examination revealed liver
toxicity and cholestasis. Specific findings included : increased
AP levels in plasma, liver enlargement and discoloration, the
presence of black sandy materials in the gallbladder, hepatocellular
necrosis and fibrosis, pseudo-bile duct formation, bile duct proliferation,
and increased mucoidal secretion in the gallbladder. Brown pigment
deposition was also found in the bile canaliculi, Kupffer cells
and the kidneys. The chronic NOEL in dogs is considered to be
0.5 mg/kg/day. (The Institute of Environmental Toxicology, 1989)
-- REPRODUCTION AND DEVELOPMENTAL TOXICITY STUDIES 1. Two-generation
Reproduction Study in Rats ¥Dithiopyr was administered via the
diet to groups of 24 male and 24 female S-D rats over 2 consecutive
generations at concentrations of 0, 25, 250 and 2500 ppm... Postmortem
examination of parental animals revealed primarily
liver toxicity, consisting of organ enlargement and discoloration,
hepatocellular swelling and necrosis, and bile stasis. Other findings
included : increased kidney weight, focal renal tubular atrophy,
thyroid follicular hypertrophy, and adrenal cortical hypertrophy.
Postmortem examination of the offspring revealed liver
enlargement and the appearance of white spots at the periphery
of the liver lobes. These findings
were accompanied by histopathological evidence of hepatocellular
swelling and localized areas of hepatocellular necrosis, fibrosis
and mineralization. The white liver
spots are considered a reversible lesion due to their declining
incidence with increasing animal age and their complete absence
in adults... (The Institute of Environmental Toxicology, 1989)
Ref: Summary of Toxicology Studies With
Dithiopyr Dennis P. WARD. Toxicology Department, The Agricultural
GroUp, A Unit of Monsanto Company
(Received February 20, 1993) -
http://wwwsoc.nii.ac.jp/pssj2/tec_info/dithiopy.pdf
Epoxiconazole
-
Fungicide - CAS No. 135319-73-2 (formerly
106325-08-0)
"Likely
to be Carcinogenic to Humans." Combined
hepatocellular tumors
in male or female mice.
Ref: April
26, 2006 . Chemicals Evaluated for Carcinogenic Potential by the
Office of Pesticide Programs. From: Jess Rowland, Chief Science
Information Management Branch Health Effect Division (7509C) Office
of Pesticide Programs, USEPA.
http://www.fluorideaction.org/pesticides/pesticides.cancer.potential.2006.pdf
-- Dose levels 23 mg/kg/day
resulted in maternal death, clinical signs, clinical chemical
effects, liver effects (i.e., damage),
histopathology, and limited number of pregnancy and pups with
reduced body weights which increased in severity to the upper
dose levels, this also indicated that doses above 23 mg/kg/day
were considered to be beyond the maximum tolerated dose (MTD)
for pregnant rats.
--Chronic toxicity. i. A series of two 1-year dog studies (study
A dose levels were 0, 1.6, 15, and 49 mg/kg/day for which a NOAEL
was established in females, and study B dose levels were 0, 0.3,
0.6, 0.9, and 1.1 mg/kg/day to determine a NOAEL in males. The
NOAEL was established as 1.1 mg/kg/day based on the following
effects: a. Mortality in the 49.0 mg/kg/day dose group with severe
clinical signs and evidence of liver
damage in those dogs which were sacrificed for humane reasons.
-- Separate chronic feeding and oncogenicity studies in rats were
performed to assess the chronic toxicity and oncogenic potential
of epoxiconazole. The chronic toxicity study was conducted at
dose levels of 0 and approximately 2, 8, 38, and 78 mg/ [[Page
57341]] kg/day. The oncogenicity study was conducted at dose levels
of 0 and approximately 2, 7, 40, and 80 mg/kg/day. The results
from the 2 studies are combined and summarized as follows: c.
Increased absolute and relative liver
weights were seen for males and/or females at dose levels 38 mg/kg/day.
d. Microscopic findings were observed in the
liver for male and/or female rats at dose levels 38 mg/kg/day,
in female adrenals at the highest dose test, and in the ovaries
at dose levels 38 mg/kg/day.
-- It has been determined that liver
tumor effects observed at the 70.4 and 205.4 mg/ kg/day dose levels
clearly exceeded the MTD. The liver
necrosis observed in the male and female mice, further support
the finding that the MTD was exceeded in the 70.4 and 205.4 mg/kg/day
dose levels. A series of mechanistic studies were performed to
elucidate and define the liver promotion
properties of epoxiconazole. The following conclusions can be
drawn from the data: The material is a potent
inducer of the hepatic cytocrome P-450 enzyme system, similar
to the drug-phenobarbital. The material induced proliferation
of the smooth endoplasmatic reticulum in the liver
centrolobular hypertrophy and induction of phase 1 and phase 2
enzymes of the xenobiotic metabolism. The
material was determined not to be an initiator of the carcinogenic
process, but a promoter of initiated
cells in the tumorgenesis as has been similarly shown with
drug--phenobarbital.
Ref:
September 22, 2000. Federal Register. [Notices] [Page 57338-57344].
Notice of Filing Pesticide Petitions to Establish Tolerances for
Certain Pesticide Chemicals in or on Food.
http://www.fluorideaction.org/pesticides/epoxiconazole.fr.sept.2000.htm
Ethalfluralin
- Herbicide - CAS No. 55283-68-6
Beagle dogs were given
0, 4, 20, or 80 mg/kg/day orally, by capsule, for 1-year. The
NOAEL was 4 mg/kg/day. The LOAEL was 20 mg/kg/ day, based on increased
urinary bilirubin, variations in erythrocyte morphology, increased
thrombocyte count, and increased erythroid series of the bone
marrow. Elevated alkaline phosphatase levels were found at the
two higher doses and siderosis of the
liver at the high dose.
Ref: Federal Register. November 14, 2001.
[PF-1052; FRL-6808-9]
http://www.fluoridealert.org/pesticides/Ethalfluralin.FR.Nov14.2001.htm
-- Subchronic toxicity
studies using mice and rats resulted
in changes in liver and kidney weights,
decreased weight gain, and changes in blood and enzyme activity.
A study using beagle dogs resulted
in changes in the liver, blood and
cholesterol..
-- A chronic toxicity and carcinogenicity study using
rats resulted in mammary gland tumors in female rats at
mid and high doses. EPA concluded on June 8, 1994, that ethalfluralin
should be classified as a Group C, possible human carcinogen,
based on the results of that study. A second study in mice caused
liver cell, blood and enzyme changes,
as well as increased liver, kidney
and heart weights in females, and decreased body weight gain.
A study using beagle dogs resulted
in changes in the blood, bone marrow, enzymes and liver.
Ref: January 1995. US EPA R.E.D. FACTS Ethalfluralin.
http://www.fluorideaction.org/pesticides/ethalfluralin.red.epa.1995.pdf
Etoxazole
- Miticide, Ovicide - CAS No.
153233-91-1
-- 90-Day oral toxicity
rodents (rat). NOAEL = 61.8/69.0
milligrams/kilogram/ day (mg/kg/day) Male/Female (M/F) LOAEL =
183.7/204.8 mg/kg/day (M/F), based upon increases in hepatic enzyme
levels, increased liver weights and centrilobular
hepatocellular swelling in both sexes and liver enlargement in
females only
-- 90-Day oral toxicity rodents (mouse).
NOAEL = 213.6/250.5 mg/kg/day (M/F) LOAEL = 878.4/994.5 mg/kg/day
(M/F), based upon periportal hepatocellular
necrosis, increased alkaline phosphatase levels, accompanied
by increased relative liver weight, liver
enlargement, and centrilobular hepatocellular swelling
-- 90-Day oral toxicity nonrodents (dog).
NOAEL = 5.33/5.42 mg/ kg/day (M/F) LOAEL = 53.7/55.9 mg/ kg/day
(M/F), based upon clinical signs (vomiting foamy fluid and mucous
stool), clinical chemistry, increased liver
weights, and centrilobular swelling in the liver and acinar
cell atrophy in the prostate.
-- Prenatal developmental toxicity in nonrodents
(rabbit). Maternal NOAEL =
200 mg/kg/day LOAEL = 1,000 mg/kg/day based upon
liver enlargement and decreased body weight gains and food
consumption. Developmental NOAEL = 200 mg/kg/day LOAEL = 1,000
mg/kg/ day based upon increased incidences of 27 presacral vertebrae
and 27 presacral vertebrae with 13th ribs in the fetuses.
-- Reproduction and fertility effects (rat).
Parental/Systemic NOAEL = 20 mg/kg/ day LOAEL = 100 mg/kg/ day
(M/F), based upon increased liver weights
in the P and F1 males and increased adrenal weights in
the P females Offspring/Systemic NOAEL = 20 mg/kg/ day LOAEL =
100 mg/kg/ day (M/F), based upon pup mortality Reproductive NOAEL
= 100 mg/kg/day LOAEL = not determined.
-- Combined chronic toxicity/ carcinogenicity rodents (rat).
NOAEL = 64 mg/kg/day (M/F). LOAEL = not determined Equivocal evidence
of carcinogenicity.
-- Chronic toxicity nonrodents (dog).
NOAEL = 4.62/4.79 mg/kg/day (M/F). LOAEL = 23.5/23.8 mg/ kg/day
(M/F), based upon increased alkaline phosphatase activity, increased
liver weights, liver enlargement (females), and incidences of
centrilobular hepatocellular swelling in the liver.
-- 78-Week carcinogenic mouse. NOAEL = 242/243 (M/ F). LOAEL =
484/482 (M/ F), based on a slight increase in the incidence of
a fatty change in the centrilobular hepatocytes
in males.
-- The weight-of- the-evidence
from the 28-day, 90-day, 52- week interim chronic toxicity/ carcinogenicity
and the 2-year chronic toxicity/ carcinogenicity rat studies shows
that the systemic effects (mainly in the
liver) occur around the same dose levels from short- term
through long-term exposure without increasing in severity. Therefore,
results of the 28-day dermal toxicity study can be applicable
to long-term exposure.
Ref:
Federal Register: September 26, 2003. Etoxazole; Pesticide Tolerance.
Final Rule.
http://www.fluorideaction.org/pesticides/etoxazole.fr.sept.26.2003.htm
Subchronic/Chronic
Toxicity
-- 870.3100 90-Day Feeding Rat NOAEL
= not determined LOAEL = 300.4/336.6 (M/F), based on clinical
signs, clinical chemistry, increased liver
weights, and histopathology
-- 870.3100 90-Day Feeding Rat NOAEL
= 18.3/20.5 (M/F) LOAEL = 183.7/204.8 (M/F) based on increase
in hepatic enzyme levels, increased liver weights and centrilobular
hepatocellular swelling in both sexes and liver enlargement in
females only
-- 870.3150 90-Day Feeding Mouse
NOAEL = 213.6/250.5 (M/F) LOAEL = 878.4/994.5 (M/F), based on
periportal hepatocellular necrosis,
increased alkaline phosphatase levels, accompanied by increased
relative liver weight, liver enlargement, and centrilobular hepatocellular
swelling
-- 870.3150 90-Day Feeding Dog NOAEL
= 5.33/5.42(M/F) LOAEL = 53.7/55.9 (M/F), based on clinical signs
(vomiting foamy fluid and mucous stool), clinical chemistry, increased
liver weights, and on centrilobular hepatocellular swelling in
the liver and acinar cell atrophy in the
prostate.
-- 870.3200 21-Day Dermal Tox Rat
NOAEL = 1000 LOAEL > 1000, no effects noted. 870.3700 Developmental
Tox Rabbit NOAEL = Maternal: 200 Developmental: 200 LOAEL = Maternal:
1000, based on liver enlargement
and decreased body weight gains and food consumption Developmental:
1000, based on increased incidences of 27
presacral vertebrae and 27 presacral vertebrae with 13 ribs (skeletal
variations) in the fetuses
Ref: US EPA Pesticide Fact Sheet. August
2002.
http://www.epa.gov/opprd001/factsheets/etoxazole.pdf
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