Dissipation Dynamics of Chlorpyrifos, Profenofos and Cypermethrin in Cauliflower Curds and Associated Soil

A persistence study of chlorpyrifos, profenofos and cypermethrin on cauliflower curd and cropped soil was conducted using gas chromatography equipped with electron capture detector (ECD) and flame photometric detector (FPD) following application at recommended (300, 50 and 500 g ai ha^-1, respectively) and double doses. Sample preparation was performed using the QuEChERS technique, validated as per SANTE 2021 guidelines. Samples were extracted with acetonitrile, treated with sodium chloride, centrifuged, dried over anhydrous sodium sulphate and cleaned using dispersive solid-phase with magnesium sulphate and PSA. Average recoveries ranged from 80–120%. Residues in cauliflower curds declined to half within two days. Safe waiting periods of 2, 11 and 8 days were suggested for chlorpyrifos, profenofos and cypermethrin, respectively. Residues of test insecticides in cropped soil were below determination limit at 20^th day after last spray at both the doses.