Organochlorine contaminants are those environmentally persistent organics which require severe monitoring control and countermeasures to avoid worldwide hazardous effects. The pesticide DDT (Cl-Phenyl-HCCCl3-Phenyl-Cl) was first applied in the early 1940s and seemed to have a bright future. The pesticide made complete human populations lice-free, and it was applied to control a great number of pestilent insects, among which the malaria mosquito was the largest target. The pesticide was effective due to its persistence, and seemed to have little effect on man, due to its low oral and dermal toxicity of 200 mg/kg bodyweight and 3000 mg/kg, respectively (Duursma and Marchand, 1974). In comparison, the oral toxicity of the non-persistent organo-phosphorus insecticide Parathion is 0.2 mg/kg.
KeywordsChlorinate Malaria Pyrene PCBs Biphenyl
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