浓缩果汁中氰戊菊酯和溴氰菊酯农药残留测定方法研究

应用柱层析净化技术和毛细管气相色谱法,采取恒温模式和不分流进样方式,在μ-ECD检测器上测定浓缩果汁样品中氰戊菊酯和溴氰菊酯农药的残留组份。测定结果表明：2种农药分离效果较好,其线性范围较宽（0.1-10mg/L,可达ppm级）,在规定浓度范围内与峰面积呈良好的线性关系;方法的最低检测限氰戊菊酯为0.560μg/L,溴氰菊酯为0.702μg/L,相对标准偏差均小于10%（5.78%-8.62%）,其加标回收率在89.2%-103.6%之间。研究建立的方法简便、快速、经济,具有良好的灵敏度、精密度和准确度,可以满足浓缩果汁样品中菊酯类农药的残留检测要求。

Study on Determination of Fenvalerate and Deltamethrin Pesticide Resi dues in Concentrated Juice

Using cleanup column chromatographic method and capillary gas chromatographic method, the paper determined content of fenvalerate and dehamethrin pesticide residues in concentrated juice sample by μ- ECD detector. The result showed separate effect of the two kinds of pesticide is better, linearity scope is broad （0.1 - 10 mg/L, up to ppm）, pesticide content with peak area was linear relation among stated concentration range. Using this method, minimum detected limit of detecting fenvalerate was 0.560μg/L, deltamethrin was 0.702 μg/L, relative standard deviations were below 10% （5.78% - 8.62% ）, the recoveries was between 89.2% - 103.6%. The method was simple, rapid and economic, has better sensitivity, precision and veracity. It can satisfied detection demand of pesticide residues in concentrated juice sample.