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Astronomers map new emission line to trace most common molecule in the universe
Molecular hydrogen (H2) makes up 99 percent of the cold, dense gas in galaxies. So mapping where stars are born basically means measuring H2, which lacks a strong characteristic signature at low temperatures. Astronomers from SRON Netherlands Institute for Space Research and the University of Groningen have now mapped an emission signal from the trace […]
International Miscellaneous -
The role of fluoroaluminate complexes on the adsorption of fluoride onto hydrous alumina in aqueous solutions
Note from Fluoride Action Network: “Since all methods [to remove fluoride] produce a sludge with very high concentration of fluoride that has to be disposed of, only water for drinking and cooking purposes should be treated, particularly in the developing countries.” Reference: Fluorosis (see Interventions), World Health Organization Abstract Activated alumina (AA) has been extensively […]
International Water Treatment -
Fluoride removal by Ca-Al-CO3 layered double hydroxides at environmentally-relevant concentrations.
Highlights Ca–Al–CO3 layered double hydroxides showed affinity for F– at 2–12 mg/L. A higher F– removal capacity at lower pH and lower temperature was observed. Only marginal defluorination improvements by calcination/microwave treatment. Fast F– uptake during the initial 20?min and little anions competition was observed. F– removal capacity is not necessarily reflected in specific surface […]
International Water Treatment -
Origin of hydrogen fluoride emission in the Orion Bar. An excellent tracer for CO-dark H2 gas clouds
Abstract Context. The hydrogen fluoride (HF) molecule is seen in absorption in the interstellar medium (ISM) along many lines of sight. Surprisingly, it is observed in emission toward the Orion Bar, which is an interface between the ionized region around the Orion Trapezium stars and the Orion molecular cloud. Aims. We aim to understand the […]
International Miscellaneous -
Fluoride-Ion Batteries: On the Electrochemical Stability of Nanocrystalline La0.9Ba0.1F2.9 against Metal Electrodes.
Abstract Over the past years, ceramic fluorine ion conductors with high ionic conductivity have stepped into the limelight of materials research, as they may act as solid-state electrolytes in fluorine-ion batteries (FIBs). A factor of utmost importance, which has been left aside so far, is the electrochemical stability of these conductors with respect to both […]
International Batteries -
A simple method for detection of low concentrations
Highlights A simple, reagent-free, non-colourimetric method for detection of fluoride in water at drinking-water-relevant 0–5?mg?L?1 concentration range. Optical fibre tip coated with aluminum by sputter deposition is degraded in the presence of fluoride, decreasing internal reflection of infrared light. Kinetics of coating degradation are correlated to fluoride concentration. Abstract Naturally occurring elevated levels of fluoride […]
International Water Treatment -
Green tea or black tea: Which one should you choose?
Note from the Fluoride Action Network This writer knows little of the potential dangers of over-exposure to fluoride. Too much fluoride can lead to a lack of elasticity in the bone as well as the potential for bone fractures. We add this article for historical purposes only. (EC) Excerpt Black tea is better for bone […]
International -
Experimental and model study for fluoride removal by thermally activated sepiolite.
Note from Fluoride Action Network: “Since all methods [to remove fluoride] produce a sludge with very high concentration of fluoride that has to be disposed of, only water for drinking and cooking purposes should be treated, particularly in the developing countries.” Reference: Fluorosis (see Interventions), World Health Organization Highlights Thermal treatment for sepiolite improved the […]
International Water Treatment -
3M to increase fluoroelastomer capacity
3M Paris – 3M is set to bring significant new fluoroelastomer capacity on stream in response to increasing global-market demand, according to Laurent Sportouch, the company’s key account manager Elastomers France. “3M is building more FKM polymerisation capacity to align with growing global demand,” he said in a presentation at a recent French rubber industry […]
International Plastics -
Shape of volcanic ash influences contamination of water sources in volcanically active regions
Kilauea, a famous Hawaiian volcano [see photo], erupts lava and basaltic ash that has high concentrations of fluorine. Credit: M. Patrick, USGS Contaminants from volcanic eruptions leach into water at different rates depending on the shape of the volcanic ash particles, according to new research that could enhancing scientists’ ability to predict water quality risk […]
International Volcanoes
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