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Unformatted text preview: March 22 nd Water-borne toxic chemicals Growing concern world-wide: collision between agriculture and the water. Heavy metals of concern: As, Cd, Cr, Cu... all associated with human toxicity levels. Arsenic: natural contamination of aquifers, orchards (used to be used as a pesticide). Linked to bladder, kidney, skin, nasal passages, liver and prostate cancers. And it is a neurotoxin. Standard for drinking water: 0.010 ppm but the goal is 0. Acute poisoning is lethal over a period of days to weeks (depending on dose), but also used in medicine. Arsenic V looks similar to phosphorus and decreases ATP or can be metabolized to Arsenic III, which is then methylated to facilitate excretion. Problem in drinking water world-wide. Bangladesh has high endogenous levels of Arsenic in aquifers. “didn’t know” and 85 million people are infect/at risk because of levels of Arsenic in aquifers....
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This note was uploaded on 08/10/2011 for the course PARA 515 taught by Professor Timothygeary during the Winter '10 term at McGill.
- Winter '10