SCIE 1P50 Lecture 8: lecture 8
18 Oct 2011
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Document Summary
Some of the original uses were as chemical weapons. Cl2 gas was used in ww1 as well as dichlorodiethyl sulphide. Later in the 1920-30s industry began to manufacture polychlorinated biphenyls (pcbs), chlorofluorocarbons (cfcs) and p,p- dichlorodiphenyltrichloroethane (ddt) these compounds made a major impact on society. Polychlorinated biphenyls (pcbs) are a class of 209 organic compounds. Only ~140 congeners of the 209 are found in the environment. Used as dielectric and heat transfer fluids in transformers, in lubricating and other oils, pesticides, paints, sealants, and plastics. Flame retardants are now found in humans and other species everywhere in the world. Chemicals used in non-stick plastic coatings are infinitely persistent in the environment and found in you blood. Ddt banned in canada in 1970(1985) and in 1972 in us. Agreement to eliminate the production of certain pops. Facilitate environmentally correct disposal of pcb wastes as soon as possible and not later than 2028.
