EESA10H3 Lecture Notes - Lecture 5: Bioavailability, Arsenic, Preservative

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Heavy metals and human health lecture 5 (february 8, 2012) Class a low toxicity but we don"t say it"s not toxic. Class b very toxic, not essential to our chemical processes. Oxidize form of metals is usually less toxic. Reduce form of metals are usually more toxic. Highest concentration is in roots then in leaves for metal contamination. Very difficult to find it somewhere, maybe find it in thermometer. Mercury is toxic in all forms (organic, inorganic). For pregnant women, they should not eat canned tuna fish and for children once a month. If someone has been exposed to high levels of mercury problems with memory lost and some kind of madness. Case study: environmental impact of cca wood preservative. Soil organisms suffer earthworms and plants. More leaching will happen in warm water, and salty marine lines. Cr (iii) helps to regulate blood sugar supplement. Copper is not very toxic to humans but very toxic to marine environments.

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