ENSC 201 Lecture Notes - Lecture 5: Dental Fluorosis, Skeletal Fluorosis, Lake Nyos
31 Oct 2017
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Document Summary
Natural chemical hazards: any type of chemical hazard caused by earth"s natural processes, a lot of chemical hazards that have a physical affect, geological hazards: Volcanoes, natural radiation (natural radon), naturally toxic groundwater (arsenic: weather/climate: Plant toxins, bacterial toxins, aflatoxin, snake venom. Builds up in crater lakes life few people. 1700 killed overnight at lake nyos, cameroon 1986 if you have ongoing volcanic activity underneath the lake co2 builds up sudden release (cid:523)it"s rare(cid:524) of surrounding area replace oxygen and kills all. Rare that there have been these accidents but the process isn"t unusual. Pipe now used to degas lake so build up doesn"t happen: fluorine (fluorine is element, fluoride is ion f- or compound contatining f) Exposure to high and damaging concentrations occurs from: no clear evidence of what happened almost everyone died but a, natural sources: (groundwater africa and asia), volcanic eruptions. Groundwater can com from naturally high concentrations of fluorine.
