Current trends of some organochlorinated pesticides in Yamuna River sediments around Delhi
Abstract
Organochlorinated pesticides viz. DDTs, HCHs, and Cyclodiene compounds have been detected in the sediment samples of Yamuna River around Delhi, India during the three seasons namely pre-monsoon, monsoon and post-monsoon. Five sampling sites were selected for the purpose of study. Among the organochlorine pesticides detected, t-DDT was the most predominant in the sediments of Yamuna River. The concentration of t-DDT was in the range of 63.0-236.0 ng/g during the pre-monsoon and decreased considerably during the monsoon (38.0-197.7 ng/g) and post-monsoon (18.4-26.8 ng/g) periods respectively. Najafgarh site was found to be carrying the maximum load of pollutants, exceeding the permissible limits
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