EESA10H3 Chapter Notes - Chapter 5: Methylmercury, Bioavailability, Lead
25 Jun 2014
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Eesa10 - lecture 5heavy metals and human health heavy metalsnaturally occurring, extracted from the earth, in ore wide environmental dispersiontendency to accumulate in select tissuestoxic in even low concentrationsclassification of metals1. Class a:k, na, mg, camacronutrients (essential for biological processes)tend to form ionic bondlow toxicity 2. Class b:hg, pb, tinonessential elementstend to form covalent bondvery toxic (form soluble organometallics3. Femicronutrientstoxicity: class > borderline > class amechanism of toxicity1. Blocking essential functional groups such as proteins or enzymes, proteins can not carry anything2. Study: environmental impact of cca wood preservative what are the wood. Preservatives?chemicals that protect wood from rotting due to insects and microbial agents and on that way to prolong age in service of wood productscca-c (chromated- copper-arsenate)content 47. 5% cro318. 5% cuo34% as2o5water borne preservative. Vacuum-pressure impregnation treatment of woodretortfixation process - chemical reaction of cr, cu and as salts with wood components production of cca treated.
