PJB-2020-406
RESIDUAL BEHAVIOUR OF CYPERMETHRIN IN SOME VEGETABLES
Wasi Ullah Khan
Abstract
The behavior and dissipation of cypermethrin on some vegetable crops was studied for compliance with newly adopted maximum residue limits (MRL) of Codex Alimentarius Commission. The insecticide was sprayed at recommended doses (60 g a.i.ha–1) on tomato, okra and cauliflower at fruit initiation stage. The treated fruits of the vegetables were randomly sampled in triplicates at 0, 3, 5, 7, 10 and 15 days’ intervals after the insecticide treatment. The samples were exhaustively extracted in ethyl acetate, followed by florisil cleanup step for analysis of cypermethrin residues by high performance liquid chromatography (HPLC). The cypermethrin dissipation conformed to pseudo–first–order kinetics. Cypermethrin degraded at almost similar rate and the half–lives ranged between 3.1–3.3, 3.4–4.2 and 2.8–4.2days in tomato, okra and cauliflower respectively. The pre-harvest intervals for compliance with MRLs were 14, 6 and 4 days for tomato, okra and cauliflower respectively.
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