Dichlorodiphenyltrichloroethane

DDT (Dichlorodiphenyltrichloroethane) DDVP, see Dichlorvos Diacetone alcohol (4-hydroxy-4-methyl-2-pentanone)... 

WEB DDT (dichlorodiphenyltrichloroethane) was the first chlorinated insecticide developed. It was used extensively in World War II to eradicate the mosquitoes that spread malaria. Its use was banned in the United States in 1978 because of environmental concerns. DDT is made up of carbon, hydrogen, and chlorine atoms. When a 5.000-g sample of DDT is burned in oxygen, 8.692 g of C02 and 1.142 g of H20 are obtained. A second five-gram sample yields 2.571 g of HC1. What is the simplest formula for DDT ... 

In a case-control study of pesticide factory workers in Brazil exposed to methyl parathion and formulating solvents, the incidence of chromosomal aberrations in lymphocytes was investigated (De Cassia Stocco et al. 1982). Though dichlorodiphenyltrichloroethane (DDT) was coformulated with methyl parathion, blood DDT levels in the methyl parathion-examined workers and "nonexposed" workers were not significantly different. These workers were presumably exposed to methyl parathion via both inhalation and dermal routes however, a dose level was not reported. The exposed workers showed blood cholinesterase depressions between 50 and 75%. However, the baseline blood cholinesterase levels in nonexposed workers were not reported. No increases in the percentage of lymphocytes with chromosome breaks were found in 15 of these workers who were exposed to methyl parathion from 1 week to up to 7 years as compared with controls. The controls consisted of 13 men who had not been occupationally exposed to any chemical and were of comparable age and socioeconomic level. This study is limited because of concomitant exposure to formulating solvents, the recent history of exposure for the workers was not reported, the selection of the control group was not described adequately, and the sample size was limited. 

By the autumn of 1939, Muller had tested 349 compounds. For his 350th compound, Muller combined the soporific chloral—the active ingredient in Mickey Finn knockout drops—with chlorobenzene and a catalyst, sulfuric acid. His product was dichlorodiphenyltrichloroethane, later known worldwide as DDT ... 

Tompkins A (2002) A prognostic parameterization for the subgrid-scale variability of water vapor and clouds in large-scale models and its use to diagnose cloud cover. J Atmos Sci 59 1917-1942 Turusov V, Rakitsky V, Tomatis L (2002) Dichlorodiphenyltrichloroethane (DDT) ubiquity, persistence, and risks. Environmental Health Perspectives 101 125-128 UNEP (2001) Stockholm convention on persistent organic pollutants. http //chmpopsint/... 

Williams, G.M. and S. Numoto. 1984. Promotion of mouse liver neoplasms by the organochlorine pesticides chlordane and heptachlor in comparison to dichlorodiphenyltrichloroethane. Carcinogenesis 5 1689-1696. 

Detectors range from the universal, but less sensitive, to the very sensitive but limited to a particular class of compounds. The thermal conductivity detector (TCD) is the least sensitive but responds to all classes of compounds. Another common detector is the flame ionization detector (FID), which is very sensitive but can only detect organic compounds. Another common and very sensitive detector is called electron capture. This detector is particularly sensitive to halogenated compounds, which can be particularly important when analyzing pollutants such as dichlorodiphenyltrichloroethane (DDT) and polychlorobiphenyl (PCB) compounds. Chapter 13 provides more specific information about chromatographic methods applied to soil analysis. 

Johnson DC, Sen M, Dey SK. 1992. Differential effects of dichlorodiphenyltrichloroethane analogs, chlordecone, and 2,3,7,8-tetrachlorodibenzo-p-dioxin on establishment of pregnancy in the hypophysectomized rat. Proc Soc Exp Biol Med 199(1) 42-48. 

Dichlorodiphenyltrichloroethane, better known as DDT, is a well-known pesticide that has caused significant environmental damage. It is easy to point fingers, blaming scientists and manufacturers for having unleashed this organic compound on an unsuspecting world. It is more difficult, however, to understand why this environmental disaster took place. 

DDT (dichlorodiphenyltrichloroethan e) Pesticide Well above 278 mg/Kg. - None identified EPA identified as of Moderate Toxicity 2000-5000 mg/Kg rat -skin LD50 Will naturally decay to DDE and then stop all further degradation... 

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