EESA10H3 Lecture Notes - Lecture 5: Bioavailability, Metalloid, Arsenic
19 Jun 2013
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Class b most toxic, class a least, borderline in between. Necessary ones can be displaced by toxic ones. Special species grow in soil but don"t take the metal; no change, as normally would be. Mechanism prevent attachment of metals to its sensitive receptors. Bind to other structure, but not creating problem. "bio + available" if it"s more available (the species of the metal) Charged ions are more available than neutral (0) ph can affect bioavailability. High amounts in root veggies & leaf veggies. Dimethyl mercury can go thru latex gloves and cause death immediately :o. Fish exposed to hg ==> eat (tuna) fish ==> we have hg. Central & peripheral nervous system affected (cns & pns) Affected fish ==> people ate fish ==> years later health problems. During fixation process, can leach out of product. Buy chromium and used to regulate blood sugar. In cr(6) ==> converts in fixation ==> becomes cr(3)
