有机氮农药多残留分析方法的研究

提出了用气相色谱直接测定水、土、粮食水果和蔬菜中10种有机氮农药多残留的分析方法.样品采用丙酮振荡或组织捣碎提取,二氯甲烷萃取,经凝结或柱层析法净化.使用Sigma2型带NPD的气谱仪测定.气谱柱长1m,内径0.2cm,填充5％OV-17/Gas Chrom Q(80—100目),该柱在恒温的色谱条件下能将10种有机氮农药完全分离.通过方法回收率及八种类型样品的添加回收率证实方法的可靠及可行性,共添加回收率为81.76—102.03％,变异系数0.52—10.33％,最低检测浓度为0.0004—0.0218ppm.

MULTIRESIDUE ANALYTICAL METHOD FOR DETERMINATION OF ORGANONITROGEN PESTICIDES

A gas chromatographic method without derivatization was established for residue analysis of 10 organonitrogen pesticides in soil, water, cereals, fruit and vegetable. The samples were blended or shaken with acetone for extraction and the extracts were partitioned with dichloromethane. After cleaning up the organic phase by coagulation or chromatographic method, the residue was detected using gas chromatography coupled with NPD and a 100cm long, 2mm id glass column packed with 5% OV-17/Gas Chrom Q (80-100). The procedure was applied to the simultaneous determination of 10 organonitrogen pesticide residues in eight substrates with satisfactory recovery (81.76-102.03%),variant coeffiaent (0.52-10.33%) and detect-ability (0.0004-0.0218 ppm).