基质固相分散-气相色谱法测定蔬菜中的甲胺磷

Determination of Vegetables Methamidophos by Matrix Solid-phase Disperse and Gas Chromatography

建立了弗罗里硅土-石墨化炭黑的基质固相分散样品前处理法,并将该方法用于不同蔬菜中甲胺磷的残留分析,GC-NPD分析检测。对固相分散剂、样品与分散剂用量比例、洗脱溶剂及用量进行了选择和优化。结果表明,五种蔬菜中甲胺磷的回收率在85.7%～109.2%之间,相对标准偏差小于8%,可见本法可以用于各种新鲜蔬菜样品中甲胺磷的残留分析。

Abstract： A new method based on matrix solid-phase dispersion （MSPD） extraction with florisil-graphitized carbon black has been developed to determine methamidophos in various vegetables. The methamidophos was assayed by gas chromatography with nitrogen-phosphorus detector. Optimization of different parameters such as the type of solid supports for matrix dispersion, the ratio of sample, sorbent, different eluents and dosage was carded out. The results showed that the recovery range is 85.7% - 109.2% with relative standard deviation lower than 8%. It proved that MSPD is a valid method to analyze methamidophos for most vegetables.