Abstract
Abstract A chromatographic method for the determination of imazapyr, a non-selective herbicide, inagricultural commodities was developed to use safety control of pesticide residue on crops, and was fullyvalidated as an official method for residue analysis. Agricultural commodities, mandarin (fruit), hulled rice(cereal grains), pepper (vegetables), potato (potatoes) and soybean (beans) were extracted with methanol andpartitioned with dichloromethane to remove the interference obtained from sample extracts, adjusting pH to2.5 by 4N hydrochloric acid. Finally, they were analyzed by high performance liquid chromatography coupledto UV detector (HPLC-UVD). The developed method had the linearity in the range of test concentrationswith coefficients of determination (r 2 ) more than 0.99. Recovery studies were carried out at three concentrationlevels (LOQ, 10LOQ, and 50LOQ) performing five replicates at each level. Recoveries were ranged between72.1 to 108.0%, with relative standard deviations less than 10%. A consistent recovery was determinedaccording to the CODEX guidelines (CAC/GL40, 2003). Finally, LC/MS with selected ion monitoring wasalso applied to confirm the suspected residues of imazapyr in agricultural samples. This developed methodfor determination of imazapyr residues in agricultural commodities. can be used as an official method.Key words residue analysis, imazapyr, HPLC-UVD, LC/MS, agricultural commodities
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