溶出伏安镉内标法测定水源水中的铅

The determination of Pb in raw water by Cd internal standard stripping voltammetry

本文采用PS4.0微机极谱仪的内标分析法定性定量视窗用镉做为内标物测定了水源水中的微量铅,采用检测下限0.3μg/L,线性范围0.3～260μg/L,相对标准偏差为8.90%,回收率为96.4%。溶出分析条件:富集电位-1.0伏,富集时间60秒,静化时间10秒;净化电位0伏,扫描速度250mV/s。波型为一阶导数。参考峰铅-0.46V。锌、锰、铜不干扰测量。

The trace Pb in raw water was determined by Cd internal standard polarograph with PS4.0 PC polarograph instrument,The DTD40 model constant temperature digest instrument was used for the beer sample treatment.The determination limit was 0.31μg/L,line range was 0.3 - 260 μ g/L, RSD was 8.90%, recovery rate was 96.4%. The dissolve analysis condition： enrichment potential 1.0V, enrichment time 60S, cleaning time 10S, cleaning potentia 10V,scan velocity 250mV/so The wave model was one dimensional differential coefficient. Pb reference peak 0.46V.Zn, Mn and Cu don＇ t disturb the determination. The analysis results was satisfactory.