Saying the chemical is too much of a risk, the mayors of Duluth and Superior, Wis., are calling on Husky Energy to stop using hydrogen fluoride at the company's Superior refinery following last week's explosion and fire. (businessnorth.com)
When raw phosphate ore is processed into water - soluble phosphate via chemical reaction with sulfuric acid, large amounts of fluoride are vaporized into the air which can contaminate surrounding land with toxic fluoride in the form of hydrogen fluoride and silicon tetrafluoride. (thehealthyhomeeconomist.com)
Because hydrogen fluoride molecules break down at high temperatures, the spectra of warmer stars show less of the gas than those of cooler ones do — even if the warmer stars contain just as much fluorine. (sciencemag.org)