latest news: Volcanoes
Showing 10 of 88 Articles:
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Indonesia. The impact of the hyperacid Ijen Crater Lake: risks of excess fluoride to human health
Alex Heikens(a), Sri Sumarti (b, c), Manfred van Bergen (b), Budi Widianarko (d), Luuk Fokkert (e), Kees van Leeuwen (f) and Willem Seinen (a) a. Institute for Risk Assessment Sciences, Yalelaan 2, 3584 CM, The Netherlands b. Faculty of Geosciences, University of Utrecht, Budapestlaan 4, 3584 CD Utrecht, The Netherlands c. Volcanology and Geological Hazard […]
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Sulfate, chloride and fluoride retention in Andosols exposed to volcanic acid emissions.
Abstract The continuous emissions of SO(2), HCl and HF by Masaya volcano, Nicaragua, represent a substantial source of atmospheric S-, Cl- and F-containing acid inputs for local ecosystems. We report on the effects of such acid depositions on the sulfate, chloride and fluoride contents in soils (0-40 cm) from two distinct transects located downwind from […]
Nicaragua Volcanoes -
City holds its breath as volcano bubbles
GOMA, Democratic Republic of Congo — Deep inside the volcano’s crater, a cauldron of scarlet lava spits, bubbles, and boils. Clouds of foul-smelling gas billow up and over the rocky rim. On a recent morning, park ranger Jean-Bosco Simpeze peered into the angry pit, then turned to face the plain below. The dawn light caught […]
Congo Volcanoes -
Nicaragua. Sulfate, chloride and fluoride retention in Andosols exposed to volcanic acid emissions
Abstract: The continuous emissions of SO(2), HCl and HF by Masaya volcano, Nicaragua, represent a substantial source of atmospheric S-, Cl- and F-containing acid inputs for local ecosystems. We report on the effects of such acid depositions on the sulfate, chloride and fluoride contents in soils (0-40 cm) from two distinct transects located downwind from […]
Volcanoes -
Sicily: Natural and anthropogenic factors affecting groundwater quality of an active volcano (Mt. Etna, Italy)
Excerpt from article: Fluoride concentrations in Etna groundwaters range from 20 to 995 mg/l (average=434 mg/l; s=217). None of the analysed waters exceeds the national MAC for drinking water. Volcanic activity is an important source of F to the atmosphere, mainly in the form of hydrofluoric acid. Massive F emissions are often related to explosive […]
Volcanoes -
New Zealand: Environmental hazards of fluoride in volcanic ash: a case study from Ruapehu volcano, New Zealand
Abstract: The vent-hosted hydrothermal system of Ruapehu volcano is normally covered by a c. 10 million m3 acidic crater lake where volcanic gases accumulate. Through analysis of eruption observations, granulometry, mineralogy and chemistry of volcanic ash from the 1995-1996 Ruapehu eruptions we report on the varying influences on environmental hazards associated with the deposits. All […]
Volcanoes -
Vanuatu: Environmental impacts on health from continuous volcanic activity at Yasur (Tanna) and Ambrym
Abstract: Continuous low-level basaltic volcanic activity, from Yasur Volcano in Tanna, and Marum and Benbow vents on Ambrym, occurred for as long as records have been kept in Vanuatu. The potential chronic health implications for the inhabitants of these two areas were investigated in a preliminary environmental sampling program. The focus was particularly on fluoride […]
Vanuatu Volcanoes -
Report. Canadian Water Quality Guidelines for the Protection of Aquatic Life: Inorganic Fluorides.
Excerpt from pages 8-9: Inorganic fluorides are released naturally into the environment through the weathering of minerals, emissions from volcanoes, and as marine aerosols (Government of Canada 1993). The most important natural source of inorganic fluorides in the environment is bedrock, from which inorganic fluoride-containing minerals are leached by groundwater, and thence into surface and […]
Volcanoes -
Mexico: Chemical characteristics of the crater lakes of Popocatetetl, El Chichon, and Nevado de Toluca volcanoes
Excerpts: Fluoride concentrations were determined also with an ion selective electrode, adding a TISAB solution for decomplexing and adjusting the ionic strength… The Nevado de Toluca crater lake… Lithium, boron and fluoride were below the detection limits… At El Chichon… Fluoride increased between 1983 and 1985 (0.16 mg/l in 1983 to 4.5 mg/l in 1985), […]
Volcanoes -
Japan: Acid alteration in the fumarolic environment of Usu volcano, Hokkaido
Excerpts from article: We have particularly focused our attention on the mineralogy of fluorides and on the distribution of fluorine in the alteration products. Although fluorides have been reported in other studies of volcanic incrustations (Naboko, 1957; Stoiber and Rose, 1974; Naughton et al., 1976; Rosenberg Philip, 1988; Keith, 1991a,b; Papike, 1992; Serafimova, 1997), the […]
Volcanoes