单扫示波极谱法测定锑精矿中痕量硒的研究

拟订出以砷作载体、共沉淀法分离富集,单扫示波催化极谱法测定锑精矿中痕量硒的方法。试验了影响测定的主要因素,在优化的条件下,方法可满足锑精矿中含硒在0 00005%以上的分析要求。对于含硒0 00481%的锑精矿11次测定,相对标准偏差RSD为4 2%,样品加标回收率在94%～106%。方法准确灵敏,操作简单,4～6h即可完成,与采用国际分析方法(GB/T)的结果一致,同时还避免了使用有毒的有机试剂,使方法更具实用性和推广价值。

STUDY ON DETERMINATION OF TRACE SELENIUM IN ANTIMONY CONCENTRATE BY POLAROGRAPHY

The separation and pre-concentration of the trace selenium in antimony concentrate by using arsenic as co-precipitation,and determination by single sweep polarography has been established.The main factors that influence the analytical results of selenium are studied.Under optimum experimental conditions,the method is applied to the determination of Se(≥0.00005%) in antimony concentrate with satisfaction results which are in agreement with those from GB/T (national standard analysis method).The precision for the sample with w_((Se))=0.00481% is 4.2% RSD(n=11) and the recoveries range 94%～106%.The proposed method is sensitive,accurate,easy operation and avoids the pollution of using organic extract.