ENSC 201 Lecture Notes - Lecture 9: Micronutrient, Acute Promyelocytic Leukemia, Water Treatment

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Naturally high arsenic in groundwater used for drinking has caused health problems in many parts of the world. Arsenic mass poisoning in west bengal (india) and bangladesh. In 1970s, un agencies promoted the use of groundwater for drinking to prevent disease spread by microbially-contaminated surface waters. Groundwater tapped by tube wells contains arsenic from natural sources. Up to 32,00 mg/l arsenic in wells. Estimated population exposed to waters containing more than 50 mg/l. Anthropogenic sources (mining, pressure-treated wood), pesticides, fungicide, rat poison. Human exposure can be through: ingestion of arsenic-bearing water or food, inhalation of arsenic-bearing dust, dermal (skin) exposure to high arsenic concentrations. Arsenite and arsenate are quite toxic inorganic species. Mmaa and dmaa are less toxic organic species. Shellfish can detoxify arsenic by converting it to organic species. Eating shellfish affects urine testing for arsenic. Inorganic arsenic (most toxic species) adsorbs on the surface of iron oxides.

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