气相色谱法测定谷物中9种有机磷农药残留量的基质效应

摘要

In the GC determination of 9 organophosphorus pesticides (OPP′s)in 5 kinds of grains,the matrix effects of the 5 kinds of samples were studied in the following respects:① matrix effects produced by samples at 3 different concentration levels were compared;② effects of 3 different extraction solvents use for extraction of the 9 OPP′s on the matrix effects were studied;and ③ difference of matrix effects produced by each of the 5 grain samples on the determination of the 9 OPPS′s were inspected separately.As shown by the experimental results,①matrix effects of enhancement or inhibition to different extents were produced by the 5 grain samples,② magnitude of the matrix effect was found to be related to the concentrations of the 9 presticides,the kinds of the extraction solvents and the kinds of the grain sample,and ③ significant differences in the magnitude of matrix effect were observed when the concentration of the pesticides and kinds of the extraction solvents were different.%对用气相色谱法测定5种谷物中9种有机磷农药残留量时，5种谷物的基质效应作了研究。主要进行了以下几方面的试验：①5种谷物在不同的浓度水平下所产生的基质效应比较；②比较了3种提取剂分别提取样品中的9种有机磷农药时的基质效应；③考察了5种谷物对测定9种农药所产生基质效应的差异。结果表明：①5种谷物对9种农药的测定均存在不同程度的基质增强或基质减弱效应；②基质效应的强弱与9种农药的浓度、提取剂的种类和谷物的类别有关；③农药的不同浓度及提取剂种类的不同对测定9种农药时样品的基质效应存在较大差异。