QuEChERS结合气相色谱-质谱联用法测定虹豆中倍硫磷及其氧类似物的残留量

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Determination of Fenthion and Its Oxygen Analogs Residues in Cowpea Using QuEChERS Combined with Gas Chromatography-Mass Spectrometry

LYU Li， YUAN Lingfang* （Zhangjiajie Quality Measurement Inspection and Testing Center， Zhangjiajie 427ooo， China）

Abstract： Objective： The paper aims to establish a method for determining the residues of fenthion， fenthion sulfone，and fenthion sulfoxide in commercially available cowpeas using QuEChERS combined with gas chromatography-mass spectrometry. Method： The samples were extracted with acetonitrile， purified by d-SPE purification tubes， measured by gas chromatography-mass spectrometry and quantified by internal standard method. Result： Fenthion and its oxygen analogues have a good linear relationship within the concentration range of 2～500ngmL-1 with correlation coefficients greater than 0.999.The recovery rate of spiked concentrations of 10， 50，and 60μgkg-1 in blank samples is 96.27% to 108.57% ， with a relative standard deviation of 0.91% to 1.58% . Conclusion： This method is accurate， effcient，safe，and practical for the determinationoftotalresidues offenthion and its oxygenanalogs in cowpeas.

Keywords： fenthion; QuEChERS; gas chromatography-mass spectrometry; cowpea

豇豆富含维生素、粗纤维和蛋白质，具有较高的营养价值和食用价值[1]。（剩余4731字）