Decontamination of profenophos and bifenthrin residues in cabbage (brassica oleracea var.capitata)

An experiment was conducted in cabbage utilizing the insecticides profenophos 50 EC (1000g a.i.ha-1) and bifenthrin 10 EC (100 g a.i.ha-1) by spraying on cabbage at head initiation stage followed by another spray after 10 days and the samples were collected at. 0, 5, 10, 15 and 20 days after last spray and analyzed. The initial deposits of 0.99 mg kg-1 profenophos recorded at 2 hours after last spray dissipated to 0.16 mg kg-1 by 5 days and below determination level (BDL) by 10th day. By removing outer top three layers the initial deposits of 0.08 mg kg-1 profenophos recorded at 2 hours after last spray dissipated to below determination level (BDL) by 5th day. The initial deposits of 2.24 mg kg-1 of bifenthrin recorded at 2 hours after last spray dissipated to 0.82 mg kg-1 by 5 days after last spay and below determination level (BDL) by 10th day. By removing outer top three layers the initial deposits of 1.66 mg kg-1 of bifenthrin recorded at 2 hours after last spray dissipated to below determination level (BDL) by 5th day.