威百亩在黄瓜和土壤中的残留分析方法

Analytical Method of Metam-sodium Residue in Cucumber and Soil

建立了威百亩在黄瓜和土壤中的残留分析方法。样品中威百亩加热转化为异硫氰酸甲酯,通过气相色谱测定异硫氰酸甲酯质量分数,折算出样品中威百亩质量分数。结果表明:异硫氰酸甲酯线性范围为0.05~10 mg/L,线性相关系数为0.999 8;威百亩在黄瓜及土壤样品中的平均回收率为78%~93%,变异系数为0.80%~5.42%。方法符合农药残留检测要求。

Using gas chromatography, the determination of metam-sodium residue in cucumber and soil was described.Metam-sodium in the sample was converted to methyl isothiocyanate, then the extracts were determined by GC. The amount of metam-sodium was calculated based on the measured values of methyl isothiocyanate. The results showed that at the concentration of 0.05-10 mg/L, the linear correlation was 0.999 8. The average recoveries of the method were 78%-93%, the relative standard deviations were 0.80%-5.42%.