QuEChERS-高效液相色谱串联质谱法测定果蔬中30种农药残留
2021-07-16王红梅肖传勇张倩曹盟盟梁晓明
王红梅 肖传勇 张倩 曹盟盟 梁晓明



摘要 [目的]建立果蔬中30种农药残留的QuECHERS-高效液相色谱串联质谱分析方法。[方法]样品经乙腈提取,氯化钠盐析分离,以乙腈-2 mmol/L乙酸铵水溶液(含0.05%甲酸,V/V)为流动相梯度洗脱,C18色谱柱分离,采用正负离子多反应监测(MRM)模式进行分析,基质配制标准溶液,外标法定量。[结果]30种农药在16 min内完好分离。在1~500 μg/L线性关系良好(r>0.99),对番茄、苹果进行3个添加水平回收试验,30种农药的回收率为77%~128%,相对标准偏差(RSD)为1.0%~12.2%。[结论]该方法简便快捷,适用于果蔬中农药残留的测定。
关键词 果蔬;QuEChERS;高效液相色谱串联质谱法;农药残留
中图分类号 TS-207.5+3文献标识码 A
文章编号 0517-6611(2021)11-0173-05
doi:10.3969/j.issn.0517-6611.2021.11.047
开放科学(资源服务)标识码(OSID):
Determination of 30 Pesticide Residues in Vegetables and Fruits by QuEChERS -High Performance Liquid Chromatography Tandem Mass Spectrometry
WANG Hong-mei,XIAO Chuan-yong,ZHANG Qian et al
(Dezhou Agricultural Products Quality and Safety Testing Center,Dezhou,Shandong 253015)
Abstract [Objective] To establish a QuECHERS-high performance liquid chromatography tandem mass spectrometry method for the determination of 30 pesticide residues in vegetables and fruits.[Method] The samples were extracted by acetonitrile and separated by sodium chloride salting out.The mobile phase was acetonitrile-2 mmol /L ammonium acetate solution (containing 0.05% formic acid,V/V) by gradient elution,separated by C18 column,analyzed by positive and negative ion multiple reaction monitoring (MRM) mode,matrix preparation standard solution,external standard method for quantitative analysis.[Result]The 30 pesticides were separated perfectly within 16 minutes.There was a good linear relationship between 1-500 μg/L (r>0.99).Three additive levels of recovery tests were carried out on tomatoes and apples.The recoveries of 30 pesticides were 77%-128%,and the relative standard deviation (RSD) was 1.0%-12.2%.[Conclusion]The method is simple,rapid and suitable for the determination of pesticide residues in vegetables and fruits.
Key words Fruits and vegetables;QuEChERS;High performance liquid chromatography tandem mass spectrometry;Pesticide residues
農药在农作物病害上的防治发挥着重要的作用,提高了农作物的产量。农药在带来经济效益的同时,由于不合理的使用,造成农产品质量下降,威胁人类的身体健康[1-4]。因此,进行农药残留检测、把好农产品质量安全关就很重要。
目前,检测农药多残留的方法主要有气相色谱法[5-7]、液相色谱法[8-9]、气相色谱-质谱法[10-12]、液相色谱-质谱法[13-16]等。由于蔬菜水果基质比较复杂,液相色谱法和气相色谱法在检测上有一定的局限性,容易出现假阳性或假阴性的情况[15],需要质谱来进行定性。山东省蔬菜水果监督抽查监测项目规定22种农药,其中部分农药GB/T 20769—2008没有覆盖到,如乙酰甲胺磷、阿维菌素、涕灭威等部分氨基甲酸酯类及其代谢物没有涉及;另外,甲胺磷、乙酰甲胺磷、氧乐果、乐果极性较大的农药在气相色谱和气相色谱-质谱联用仪灵敏度较低,基质干扰大,色谱峰型较差,而这些农药在液相色谱-质谱上基质干扰小、灵敏度较高。该研……
