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Surface Water Contamination Studies In The Nilgiris, India

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:   No Citation available.
Authors:   K Bhuvaneswari, A Regupathy, G.S.V Raghavan

The insecticide contamination in the water bodies of The Nilgiris district was assessed using the surface water samples collected by dip sampling method from farm ponds/collection wells and other irrigation sources. Fifteen sample locations adjacent to farm lands were selected so as to represent the major vegetable cultivating villages of the district. The water samples were analysed for the residues of carbofuran, quinalphos and phorate, the most commonly used insecticides which are applied by in furrow method for the management of pests of vegetables. The per cent occurrence of insecticide residues observed in the samples was 60.6, 56.1, 57.6 and 52.3 for carbofuran, quinalphos, phorate and fenvalerate, respectively. The insecticide residues were detected in the range of 50 to 1200 ng/lit for carbofuran, 10 to 740 ng/lit for quinalphos, 20 to 940 ng/lit for phorate, and 56 to 627 ng/lit for fenvalerate. The 50th percentiles calculated for carbofuran, quinalphos and phorate residues were 0.153, 0.056 and 0.006 g/g.

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