Determination of 19 organophosphorus pesticide residues in pomegranatesusing QuEChERS coupled with gas chromatography-triple quadrupolemass spectrometry
JIN Ting1, SUN Xin2, LI Zhuowa1, FENG Xiaohui1, TAN Shengbing1, WANG Minglin2*
1(College of Food Science and Pharmaceutical Engineering, Zaozhuang University, Zaozhuang 277000, China) 2(College of Food Science and Engineering, Shandong Agricultural University, Tai’an 271000, China)
Abstract: QuEChERS and gas chromatography-triple quadrupole mass spectrometry were adopted as an efficient method to detect and analyze nineteen organophosphorus pesticide residues in pomegranates. The sample was prepared by optimized QuEChERS, extracted with ethyl acetate and purified by primary secondary amine sorbent (PSA) adsorbent. The nineteen organophosphorus pesticide residues were separated by an Rtx-5MS column, and determined using MS/MS in multiple reactions monitoring mode. All correlation coefficients of calibration curves were over 0.99 in the linear concentration range 0.01-1.0 mg/L. The detection limit (S/N=3) was 0.9-3.7 μg/kg, and the quantitation limit (S/N=10) was 3-12.2 μg/kg. The recovery rate was 73.5%-120.9% with relative standard deviations (RSDs) between 1.1% and 15.7%. Two kinds of pesticides, monocrotophos and dimethoate, were detected from pomegranates available from the market by this method. This method proved to be rapid, accurate, and with high sensitivity. It can be applied for simultaneous determination of organophosphorus pesticide residues in pomegranates
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2019, Vol. 45 
