Lecture 8 DDT

Lecture 8 DDT - DDT The GOOD, The BAD And the Deadly OR...

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DDT The GOOD, The BAD And the Deadly
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OR NOT! History Environmental Effects
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DDT : An Ecotoxicology Model IUPAC Name: 1,1,1-trichloro-2,2-bis- p- chlorophenylethane Structure: Water Solubility << (ppm) Kow HIGH Adsorption >> Vaporization > due to large air volume Bioaccumulation >> BCF HIGH Degradation << due to structure halogens Co-metabolism > > > > CO 2 and H 2 0
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History: 1874 1 st synthesis Othwar Ziedler Cl aromatic rings 1939 Pesticide Qualities recognized Paul Mueller – Swiss 1942 Geigy Co. to USDA Potatoe beetle Patented – approved use WWII Use – human health (pix) Lice Typhus – Italy (1944 standard) Mosquito – Malaria control South Pacific 1945 - > 3 million people dusted more death from war wounds than from Typhus Late 40s American farming Use 1 lb per acre – kill Boll Weevils increase yields Spray forests – budworms, gypsy moth
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Delousing Germany WWII
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Body Lice Pediculus humanus Rickettsia prowazekii typhus Rocky Mnt Spotted fever, Erlichiosis
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History: 1874 1 st synthesis Othwar Ziedler Cl aromatic rings 1939 Pesticide Qualities recognized Paul Mueller – Swiss 1942 Geigy Co. to USDA Potatoe beetle Patented – approved use WWII Use – human health Lice Typhus – Italy (1944 standard) Mosquito – Malaria control South Pacific 1945 - > 3 million people dusted more death from war wounds than from Typhus
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Late 40s American farming Use 1 lb per acre – kill Boll Weevils increase yields Spray forests – budworms, gypsy moth
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Early crop dusting, by land and air, could not exterminate boll weevils, even with increasingly poisonous insecticides including calcium arsenate, toxaphene, endrin and DDT.
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History cont. 1950s
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Lecture 8 DDT - DDT The GOOD, The BAD And the Deadly OR...

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