31 Organics and Kow

31 Organics and Kow - Persistence of Synthetic Organic...

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Unformatted text preview: Persistence of Synthetic Organic Chemicals Dioxin PCB DDT 10 g/L 0.2 g/L < 0.1 g/L Organochlorines : persistence related to water solubility Soluble in organic solvents, lipid tissues, organic sediments Bioaccumulation in Organisms The chemical essentially dissolves into the lipid tissues carbon Dioxin Seawater Arctic cod muscle Narwhal blubber 14 - 46 ppb 0.0003 ppb 2440 - 9160 ppb Toxaphene 50,000 X ~ 8 M X carbon lipid 400,000 tons: 1946 to 1974 (670 chemicals) Water Organic Sediments Environmental Persistence Solubility of < 0.1 g/L Organic chemicals become stored in organic sediments This protects them from degradation and increases their lifetime in the environment DDT Lake Michigan g PCB/Kg sediment (parts per billion) EPA 2004 mg Carbon /g sedimen N Concentration Organic Carbon PCBs PCBs banned in 1979 Open water PCB concentration = < 1 part per trillion Florida Lakes and Organics DDT d ichloro-d iphenyl-t richloroethane First Modern Pesticide Insecticide developed to combat insect-borne disease Use was later expanded to include agriculture 1948 Nobel Prize in Physiology and Medicine Launch of the Environmental Movement 1962 human volunteers ingested 35 mg of DDT primates were fed 33,000 times more DDT than the estimated exposure Thinning egg shells Lower hatching rates Declining Eagle population Carcinogenic decline in the eagle population occurred before the DDT years (bounties between 1917 and 1942) http://faculty.unionky.edu/rbotkin/RECM_480_ISSUE_16A_YES_BLUE.PPT#291,22,Issue%2016:%20Yes DDT levels ranging from 2,200 to 110,000 g/kg (ppb) in organic soils and sediments....
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31 Organics and Kow - Persistence of Synthetic Organic...

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