Department of Chemistry, Fudan University, Shanghai 200433, PR China.
Talanta. 2011 Sep 30;85(4):1766-71. doi: 10.1016/j.talanta.2011.06.074. Epub 2011 Jul 7.
In this work, an analytical method for GC using direct solid sample introduction was developed to tackle the problem regarding quick detection of pesticide residue in crops and large-scale screening of samples. 10mg of the crop solid sample without sample pre-treatment was directly introduced into a modified split/splitless injector for GC analysis. A split/splitless injector was modified to quickly remove oxygen and low boiling-point matrices of the sample. The whole sampling procedure was simple and it required less than 5 min. The experimental parameters including injector-port temperature, removal of oxygen and low boiling point matrices, size and the amount of the solid sample, oven temperature program were studied. Satisfactory recoveries of 6 pesticides (methyl parathion, fenitrothion, aldrin, dieldrin, endosulfan, o,p'-DDT) were obtained in maize and rice sample. Relative standard deviation was less than 15%. Experimental results showed that the proposed method was quick and reliable for pesticide residues analysis in crops.
在这项工作中，开发了一种用于 GC 的直接固体进样分析方法，以解决有关快速检测农作物中农药残留和大规模筛选样品的问题。将 10mg 未经样品预处理的农作物固体样品直接引入改良的分流/不分流进样器进行 GC 分析。对分流/不分流进样器进行了改进，以快速去除样品中的氧气和低沸点基质。整个采样过程简单，耗时不到 5 分钟。研究了包括进样口温度、去除氧气和低沸点基质、固体样品的大小和数量、炉温程序在内的实验参数。在玉米和水稻样品中，6 种农药（甲基对硫磷、杀螟硫磷、艾氏剂、狄氏剂、硫丹、o,p'-滴滴涕）的回收率令人满意。相对标准偏差小于 15%。实验结果表明，该方法快速可靠，可用于农作物中农药残留的分析。
