DDT dichlorodiphenyltrichloroethane

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. 

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/... 

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. 

Dichlorodiphenyltrichloroethane (DDT) Increased susceptibility for infection (chicken, duck) Reduced antibody responses (rabbit)... 

Similar considerations are relevant for other airborne, persistent, bioaccumulating pollutants, primarily polychlorinated biphenyl (PCB) and dichlorodiphenyltrichloroethane (DDT). Naturally occurring toxins - mycotoxins... 

Chlorobenzenes have been widely used as solvents and degreasing agents in pesticides, including dichlorodiphenyltrichloroethane (DDT), and in dielectric fluids as industrial precursors in the production of phenols and as dyestuff intermediates. Chlorobenzenes represent a unique class of compounds because their hydrophobicity increases with chlorine substitution,... 

The peak at m/z 316 therefore corresponds to a compound C14H8C14 in which all four chlorines are 35C1. The respective molecular formulas indicate that DDE is the dehydrochlorination product of dichlorodiphenyltrichloroethane (DDT). 

Aluminum, arsenic, barium, cadmium, calcium, copper, chromium, iron, lead, magnesium, manganese, mercury, nickel, phosphorus, potassium, selenium, sodium, sulfur, thallium, zinc, aldrin, dichlorodiphenyldichloroethane, dichlorodiphenyldichlorethene, dieldrin, hexachlorobenzene, heptachlorepoxide, hexachlorocyclohexane, dichlorodiphenyltrichloroethane (DDT), PCBs, pentachlorophenol, P,P -DDT... 

Dichlorodiphenyltrichloroethane (DDT) is no longer being used in large amounts because of its persistence in the environment, although for many uses there were no good substitutes available. DDT was first made in 1874 but its insecticidal properties were not discovered until 1939. 

Representative Chemicaes Aldrin (CAS 309-00-2) Dieldrin (CAS 60-57-1) Alkyl-lead (CAS 7439-92-1) Benzo(d )pyrene (CAS 50-32-8) Chlordane (CAS 57-74-9) Dichlorodiphenyltrichloroethane (DDT) (CAS 50-29-3) Hexachlorobenzene (CAS 118-74-1) Mercury and compounds (CAS 7439-97-6) Mirex (CAS 2385-85-5) Octachlorostyrene (CAS 29082-74-4) Polychlorinated biphenyls (PCBs) (CAS 11097-69-1 for Arochlor 1254) 2,3, 7,8-Tetrachlorodibenzo-/7-dioxin (TCDD) (CAS 1746-01-6) and chemically similar compounds collectively known as dioxins and furans Camp-hechlor (toxaphene) (CAS 8001-35-2)... 

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