毛木耳中拟除虫菊酯杀虫剂多残留分析方法

建立毛木耳上联苯菊酯、甲氰菊酯、高效氯氟氰菊酯、高效氯氰菊酯、氰戊菊酯和溴氰菊酯等6种拟除虫菊酯杀虫剂的多残留分析方法。样品经乙腈提取,弗罗里硅土(5%脱活)柱层析净化,石油醚/乙酸乙酯(V/V=98/2)淋洗液洗脱,淋出液浓缩后用正己烷定容供气相色谱-电子捕获检测器(GC-ECD)检测。添加回收实验结果表明,供试6种拟除虫菊酯杀虫剂的添加浓度为0.005~0.5 mg·kg-1时,线性关系良好,相关系数大于0.9990;添加回收率为81.68%~96.39%,RSD为1.87%~5.82%,最低检测浓度为0.005 mg·kg-1;多残留分析方法的准确性、精确性以及灵敏度均满足农药残留分析的要求。

Multiresidue determination of six pyrethroid pesticides in Auricularia polytricha

A rapid multirsidue analytical method for determination of six pyrethroids in Auricularia polytricha was developed by gas chromatography (GC) with electron capture detection (ECD). The pestcide residues were extracted by acetonitrile, cleaned up by florisil column and detected by GC-ECD. The ECD response for selected pesticides was linear between 0.005 and 0.5 mg·kg^-1, and the correlation coefficients were greater than 0.9990. The average recoveries of the six pesticides ranged from 81.68% to 96.39% in Auricularia polytricha. The relative standard deviations were 1.87%-5.82% and the minimum detectable concentrations of selected pesticides were 0.005 mg·kg^-1. These results showed that the method met the requirement for pesticide residue analyses.