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利用液相色谱-串联质谱法(LC/MS/MS)建立了蔬菜中噻虫嗪农药测定的方法。方法试样中噻虫嗪农药残留在超声波振荡条件下用乙腈提取,经石墨化炭黑(Carb)和N-丙基乙二胺(PSA)粉末净化,经液相色谱质谱联用仪检。噻虫嗪农药残留的色谱图分离效果良好,在0.5~50.0 ng/m L质量浓度內呈现良好线性关系,R=0.999 9,方法的检出限为0.3μg/kg,回收率为89.9%~102.4%,相对标准偏差为1.8%~3.75%。该方法简单、快速、灵敏、净化效果好、回收率高,适合蔬菜中噻虫嗪农药残留的检测和安全监控。
A method for the determination of thiamethoxam pesticides in vegetables was established by liquid chromatography-tandem mass spectrometry (LC / MS / MS). Methods Residues of thiamethoxam pesticide residues were extracted with acetonitrile under ultrasonic agitation, purified with Carb and N-propyl ethylenediamine (PSA) powders and detected by liquid chromatography-mass spectrometry. The chromatogram of thiamethoxam pesticide residues showed a good linearity with a linear range of 0.5-50.0 ng / m L, with R = 0.999 9, the detection limit was 0.3 μg / kg and the recovery was 89.9% 102.4%, the relative standard deviation was 1.8% ~ 3.75%. The method is simple, rapid and sensitive, has good purification effect and high recovery rate, and is suitable for the detection and safety monitoring of thiacloprid pesticide residues in vegetables.