气相色谱法测定蔬菜中有机磷农药残留的基质效应研究
2021-02-21李新梅
李新梅



摘 要:对气相色谱法检测蔬菜中有机磷农药残留的基质效应进行了分析研究。结果表明,12种有机磷农药在6种蔬菜基质中均存在不同程度的基质效应,基质效应的强弱与农药种类和蔬菜种类有关。采用基质校正,黄瓜、番茄、豇豆、青菜等4种蔬菜能起到很好的基质校正效果。在有机磷农药残留的检测中,建议采用基质配制标准溶液对农药残留进行定量,确保检测结果的准确性。
关键词:气相色谱;蔬菜;农药残留;基质效应
中图分类号 S481.8文献标识码 A文章编号 1007-7731(2021)02-0128-03
Matrix Effects on Determination of Organophosphorus Pesticide Residues in Vegetables by Gas Chromatography
LI Xinmei
(Agricultural and Rural Bureau of Jintan District, Changzhou 213200, China)
Abstract:The matrix effects of organophosphorus pesticides residues in vegetables were analyzed by gas chromatography.The results showed that 12 organophosphorus pesticides in 6 vegetables had different matrix effects and the matrix effects were related to the kinds of organophosphorus pesticides and vegetables.Using matrix correction, cucumber, tomato, cowpea and green vegetables can get good matrix correction effects.In the detection of organophosphorus pesticide residues, it is recommended to use matrix preparation standard solution to quantify pesticide residues, so as to ensure the accuracy of the detection results.
Key words: Gas chromatography; Vegetables; Pesticide residues; Matrix effects
長期以来,农药的使用在防治病虫害、提高农业生产效率中发挥了重要作用。但与此同时,农药残留也是农业安全生产中不容忽视的重要问题,其中,有机磷农药在农产品的农药残留检测中占比高达70%[1]。蔬菜因其丰富的种类和组成多样,是日常开展农药残留检测的主要分析对象。气相色谱具有高灵敏性、高通量等特点,在农药残留测定中备受青睐,然而分析的准确性常常受到基质效应的影响。基质效应是指样品中的其他成分对待测物测定值的干扰和影响,即基质对分析方法准确测定分析物的能力的干扰[2]。其表现为以纯溶剂配制的农药标准品和以样品基质配制的农药标样中农药组分检测值存在差异,从而影响分析结果。基质对待检物测定的影响可分为基质增强效应和基质减弱效应。基质效应与农药结构、蔬菜类型有关[2],农药残留分析中大都采用基质匹配标准溶液进行定量,以克服基质效应对定量的影响[3]。……
