Vol. 2, Issue 8 (2015)
Groundwater contamination through pesticide usage in vegetable growing areas of Delhi
Author(s): S Thakur, K Gulati, T Jindal
Abstract: Groundwater samples were collected from eight tube wells of different vegetable farm fields growing various vegetables like: Tori (Luffa acutangula), Ladyfinger (okra), Beans (Phaseolus vulgaris), Radish (Raphanus sativus), Corn (Zea mays), Arbi (Colocasia esculanta), Spinach (Basella alba) and Chilli (Capsicum Annum) in Yamuna Khaddar region, Delhi. Residues were estimated by GC-ECD and GC-FPD system equipped with capillary columns for organochlorine, synthetic pyrethroid and organophosphate insecticides. In groundwater, 31.2% samples were found contaminated with organochlorine pesticides. While 19.4% samples were contaminated with organophosphate pesticide. Synthetic pyrethroids were not detected in groundwater samples. Concentration of organochlorine pesticides ranged from 0.293 to 1.462µg/l in groundwater sample. While concentration of organophosphate pesticides ranged from 0.159 to 39.90µg/l. Almost 93% samples were found contaminated with organochlorine pesticides and organophosphate pesticides respectively. According to the analysis, residues of the banned organo chlorine pesticide residues (DDT and BHC) were found above MRL value. It seems that they are present either due to the high persistence of these pesticides or due to their continuous use in the form of adulterated pesticides by farmers. The study reveals that rigorous extension services are required to make the farmers aware about the harmful residues in water and switching to safer molecules like synthetic pyrethroids and Integrated Pest Management techniques for the judicious use of pesticides.