SCIE 1P50 Lecture Notes - Stockholm Convention On Persistent Organic Pollutants, Dielectric, Bioavailability
9 Oct 2011
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Document Summary
Some of the original uses were as chemical weapons. Later in the later 1920s and 1930s, industry began to manufacture polychlorinated biphenyls (pcbs), chloro uorocarbons (cfcs or freons), and p, p- dichlorodiphenyltrichloroethane (p, p-ddt, generally called ddt). These compounds made a major impact on society, especially ddt. Polychlorinated biphenyls (pcbs) are a class of 209 organic compounds. Only ~140 congeners of the 209 are found in the environment. Used as dielectric & heat transfer uids in transformers, in lubricating and other oils, pesticides, paints, sealants, and plastics. Flame retardants (pbdes/hbcds) are now found in humans and other species everywhere in the world. Chemicals used in non-stick plastic coatings are in nitely persistent in the environment and found in your blood. Ddt banned in canada in 1970(1985) and 1972 in u. s. Mid latitudes - seasonal cycling of deposition and evaporation. Agreement to eliminate the production of certain pops. >152 countries signed the agreement to date.
