基质固相分散-气相色谱法测定小麦中5种拟除虫菊酯类农药残留

Determination of Pyrethroid Pesticides Multi-residues in Wheat by Matrix Solid-phase Dispersion and Gas Chromatography

建立小麦样品中5种拟除虫菊酯类农药残留同时进行测定的方法。以弗罗里硅土基质分散剂对小麦样品进行前处理,用气相色谱-电子捕获检测器测定,考察基质分散剂、洗脱剂和样品填料比对农药残留测定的影响。结果表明:5种拟除虫菊酯类农药的平均回收率均在85.5%～97.6%之间;其结果(n=5)的相对标准偏差(RSD)最大值为8.4%。这表明该方法是一种经济、快速、准确、重现性好的检测方法。

A rapid method to determine 5 pyrethroid pesticide residues in wheat was established through optimizing the absorbent,elute,and sample to absorbent ratio.Wheat sample was treated by the matrix solid-phase dispersion（MSPD） technique using Florisil as absorbent.5 pyrethroid pesticides were analyzed by gas chromatography with electron capture detector.The mean recoveries of 5 pyrethroid pesticides were ranged from 85.5% to 97.6% and the maximum RSD was 8.4%.This method is cost-saving,rapid,accurate,sensitive and can therefore be applied for simultaneous determination of pesticide residues in wheat.