Detection of the herbicide fenoxaprop-P-ethyl, its agronomic safener isoxadifen ethyl and their metabolites residue in rice
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Keywords
chromatography, herbicide, mass spectrometry, residues, rice
Abstract
Introduction The herbicide fenoxaprop-P-ethyl and its agronomic safener isoxadifen ethyl, are used on cereals, and their as well as main metabolites residues can occur in rice. Objectives The present work aims to develop and to validate an analytical method for the determination of the herbicide, its safener and their metabolites in rice edible fractions. Methods Samples were extracted in acetonitrile (under acid conditions for active substances analysis); then, parent compounds were determined by gas chromatography with a mass spectrometer detector, while metabolites were analysed by liquid chromatography tandem mass spectrometry. Results The method was validated in rice straw, grain and plant: accuracy (mean recovery) was in the range 76–86% and 90–103% for parent compounds and metabolites, respectively, while precision (relative standard deviation) was in the range 3–11% and 6–17%. The limit of detection was 0.01 mg kg1 for each analyte while limit of quantification was set to 0.05 mg kg1. Analysis of field collected samples enabled to remark differences. Conclusion The analytical method is suitable for the quantitative determination of each analyte considered in rice commodities.
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