Abstract

Environmental contamination of natural waters by pesticide residues is of great concern. Pesticides are divided into many classes, of which the most important are organochlorine and organophosphorus compounds. Organochlorine pesticides are known to resist biodegradation and therefore they can be recycled through food chains and produce a significant magnification of the original concentration at the end of the chain. Organophosphorus pesticides on the other hand are known to degrade rapidly depending on the their formulation, method of application, climate and the growing stage of the plant (Khan 1980). Pesticide residues reach the aquatic environment through direct run-off, leaching, careless disposal of empty containers, equipment washings etc.

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