An analytical method of gas chromatography coupled with negative ion chemical ionization-mass spectrometry for simultaneous determination of nine organophosphorous pesticide residues in vegetables and fruit has been developed , and the negative ions structure and partition mechanism of the nine organophosphorus pesticides were interpreted. Meanwhile, the matrix effect for sample analysis was discussed, and matrix-matched calibration for quantification was introduced to reduce the matrix effect in this method. Pesticides were extracted from sample with ethyl acetate in an ultrasonic bath , then determined by gas chromatography-mass spectrometry operated in negative chemical ionization mode and quantified in selective ion monitoring mode i and ethion was used as an internal standard. The detection limits of the method were 0. 12 - 1. 0 μg/kg for the nine organophosphorus pesticides, and the relative coefficients were higher than 0. 999 3. A blank sample (tomato) was spiked at 100) 400, 800 μg/kg for each pesticide ) and the recoveries were determined to be from 78% to 126% with relative standard deviations from 0. 58% to 14. 7% for the pesticides.
CITATION STYLE
Lin, Z., Fan, Y., Ma, Y., Jin, Z., Tan, J., Chen, M., … Liu, Y. (2006). Multiresidue determination of organophosphorus pesticide residues in vegetables and fruit by gas chromatography-negative ion chemical ionization-mass spectrometry. Chinese Journal of Chromatography (Se Pu), 24(3), 221–227.
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