Author(s):

Ashraf Alam Wani, Ishrat Jan, Alamgir A Dar, Sofi Mubashir, Khurshid A Sofi, Javid A Sofi and Irshad H Dar

Abstract: The present study was conducted to evaluate the persistence, half-life, dissipation behaviour and risk assessment of Chlorpyrifos on green pea by gas chromatography-electron capture detector. Chlorpyrifos 20 EC at 300g.a.i.ha^-1 was applied during fruiting stage followed by another application at 10 day interval. The samples were extracted by using quick, easy, cheap, effective, rugged, and safe (QuEChERS) method. Herein we report a modified accurate and cost-effective gas chromatography method for the determination of average deposits of Chlorpyrifos on green pea. The initial deposits were found to be 1.37 mg kg^-1 and reached below limit of determination after 15 days at recommended dosage with half-life period of 1.77 days. For risk assessment studies, a waiting period of 15 days at the recommended dosages is suggested safe for the consumption of green pea. The developed method is simple, sensitive, selective and repeatable and can be extended for Chlorpyrifos based standardisation of herbal formulations containing green pea and its use in pesticide industries.

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