Abstract
A rapid, sensitive and selective analytical method was validated to determine imidacloprid residue in okra using ultra-high-performance liquid chromatography coupled with a photodiode array detector (UHPLC-PDA). The analytical method showed good linearity, and the limit of quantification was 0.025 mg/kg. Recoveries were ranged from 92.40 to 109.68%, with the relative standard deviation (RSD) of 1.87 to 4.84%. Field results showed that the mean initial deposit of imidacloprid on okra fruits were found to be 0.29 and 0.43 µg.g-1, recommended and doubled the dose, respectively. The residues reached below the detection limit (BDL) of less than 0.025 µg.g-1 on 7 and 10 days after treatment with the recommended and doubled the recommended dose, respectively. The half-life of imidacloprid in okra was 1.58 and 2.02 days, at recommended and double the recommended dose, respectively and a harvest withholding period of one day has been suggested for safe consumption.
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