Analyses of pesticide residues in water, sediment and fish tissue from river Deomoni flowing through the tea gardens of Terai Region of West Bengal, India

Analyses of chlorpyriphos, ethion and dicofol in the river Deomoni from Terai region of West Bengal revealed mean pesticide residues of chlorpyriphos, dicofol and ethion in water sample as 0.0091 ± 0.0020ppm, 0.0180 ± 0.0071ppm and 0.0892 ± 0.0375 ppm, respectively, in sediments 0.0513 ± 0.0085ppm, 0.0414 ± 0.0045ppm and 0.1271 ± 0.0122ppm and in fish muscles (Puntius sp.) 5.0371 ± 1.4236 ppm, 3.7700 ± 0.6391ppm and 2.9599 ± 0.4027ppm, respectively. Analysis of pesticide residues by one way ANOVA for chlorpyriphos, dicofol and ethion in the water and sediments, the sediment and muscles and water and muscles were found to be highly significant (p<=0.001) except for dicofol in water and sediment, which is significant at p<=0.01. The result indicates that river Deomoni is contaminated by pesticide from the nearby tea gardens which affects the water quality and non target organisms like fishes thereof.