The examples of organochlorinated pesticides are DDT, heptachlor etc. which have longer residual effects and sevin, furadan etc. are under organocarbamate group that have shorter residual effect. But why?
Organochlorine (halogen) compounds degrade generally quite slow in the environment. Thus they accumulate and are active longer than faster degrading organofosfates and carbamates.
Dear Abul Kalam Azad,
most organochlorine pesticides exhibit high toxicity, slow degradation and bioaccumulation with half-life up to 10–15 years. Their persistence is mainly due to strong chlorine-carbon bonds. Carbamates are derivatives of carbamic acid, their functional groups are carbamate esters enabling break-down in the environment within weeks or months.
Best regards,
Johannes
Organochlorine pesticides are strong lipophilic that proved to be stored in the fat tissue for several years and even found in mammals milk passing generation. their half-life is high and their persistence is due to the string chlorine-carbon bond which is not the case in Carbamate compounds where esters are the main functional area in their composition
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