Organochloride insecticide residues in air in Delhi,India |
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| Authors: | C P Kaushik M K K Pillai A Raman H C Agarwal |
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| Institution: | 1. Department of Zoology, University of Delhi, Delhi
2. National Environmental Engineering Research Institute, 110007, Delhi, India
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| Abstract: | Regular monitoring of air at three different sites, namely, Netaji Nagar, Moti Nagar and Town Hall in the metropolitan city of Delhi, India from June, 1980 to May, 1982 revealed varying levels of residues of DDT and HCH. The concentration of total DDT residues varied from 4 to 232 ng m?3 with an average of 60 ng m?3. Total HCH ranged from 0 to 21797 ng m?3 with an average of 438 ng m?3. Comparatively higher levels of total DDT (73 ng M?3) were detected at Moti Nagar, the site near a DDT factory. The total HCH was highest at Town Hall (931 ng m?3). Normally, higher quantities of the residues of DDT and HCH were detected during October to December. The insecticide residues consisted mainly of p, p′-DDT, p, p′-DDE, o, p′-DDT and p, p′-DDD, α- and γ-HCH. Only p, p′-DDT and p, p′-DDE were detected in all the samples and accounted for the bulk of total DDT. The HCH residues were mainly due to the α-isomer. Generally the concentration of HCH was higher than DDT in the air samples collected during the survey. |
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