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Lecture_5_Heavy_metals - Heavy Metals and Human Health...

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Heavy Metals and Human Health
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Heavy Metals Naturally occurring, extracted from the earth in ore Wide environmental dispersion Tendency to accumulate in select tissues Toxic in even low concentrations
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Classification of metals 1. Class A: K, Na, Mg, Ca Macronutrients (essential for biological processes) Tend to form ionic bond Low toxicity 2. Class B: Hg, Ti, Pb, Ag, Au Nonessential elements Tend to form covalent bond Very toxic (form soluble organometallics)
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