Micropollutants Levels In Macroinvertebrates Collected From Drinking Water Sources Of Delhi,India

Heavy metals and organochlorine pesticide's residues were measured in the benthic macroinvertebrates taken from raw water of three water works, namely the Gokulpuri water works (Yamuna tank and Ganga tank), Haiderpur water works and Wazirabad water works in the National Capital, Delhi, from January 1997 to July 1997. These water works obtain raw water supply from the River Yamuna, the Western Yamuna Canal and the Gang Canal. The biota samples collected with the help of artificial substratum were found to accumulate varying levels of these micropollutants. The disposal of partially treated/untreated wastewater and contribution of agricultural chemicals, like fertilizers and pesticides either through run-off or through ground water, may be the main sources of such micropollutants in biota.