茶叶中虱螨脲等6种农药残留量的检测及结果分析

Analysis of Detection Results of Six Pesticides’ Residues Including Lufenuro in Tea

为打破发达国家设置关于茶叶中虱螨脲等6种农药残留的绿色壁垒,提高我国茶叶出口质量,降低茶叶出口贸易风险,研究建立茶中虱螨脲等6种农药残留量的检测方法。文中首先确定6种农药的质谱参数,并优化液相条件,然后通过优化实验条件建立了茶叶中虱螨脲等6种农药残留量的液相色谱-串联质谱检测方法。方法的标准曲线相关系数、精密度、回收率、检测限、定量限等指标符合GB/T 27404-2008《实验室质量控制规范食品理化检测》要求。用该方法对151批市售样品进行检测,除氯噻啉外其他5种农药均有检出。该方法便捷、高效、准确、灵敏,可用于茶叶中虱螨脲等6种农药残留量的测定。

In order to break the green barriers set up by developed countries about 6 pesticide residues such as lufenuron in tea,improve the quality of China’s tea export,and reduce the risk of tea export trade,the detection methods for 6 pesticide residues such as lufenuron in tea were studied and established.Firstly,the mass spectrometry parameters of the six pesticides were determined,and the liquid phase conditions were optimized.Then,a liquid chromatography-tandem mass spectrometry method was established for the determination of six pesticide residues including lufenuron in tea by optimizing the experimental conditions.The correlation coefficient of standard curves,precisions,recoveries,limit of detections,limit of quantifications and other indicators of the method meet the requirements of GB/T 27404-2008 standard:Criterion on Quality Control of Laboratories-Chemical Testing of Food.151 batches of commercial samples were tested by this method,and all five pesticides except chlorothiline were detected in tea.The method is convenient,efficient,accurate and sensitive,and can be used for the determination of 6 pesticide residues including lufenuron in tea.