威百亩在黄瓜和土壤中的残留分析方法

摘要

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0.9998;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 0.9998. The average recoveries of the method were 78％-93％, the relative standard deviations were 0.80％-5.42％.