离心分离锌还原质量法测定铑

The determination of rhodium by zinc reduction mass-metrical analysis through the use of centrifugal separation

锌还原质量法测定样品中的铑具有所需设备简单和操作方便等特点 ,是目前广泛采用的测定铑含量的方法 ,尤其适用于铑含量较高样品的分析。但是 ,该方法在灼烧沉淀时 ,金属铑会被部分氧化成氧化铑 ,使测定结果偏高。文中研究了锌还原质量法测定铑含量时 ,用离心分离铑粉代替过滤分离铑粉 ,并将灼烧金属铑沉淀改为烘干沉淀 ,操作更易控制 ,测定的准确度和精密度都符合要求 ,能够有效地避免锌还原质量法测定铑结果偏高的缺陷。

The determination of rhodium by zinc reduction mass-metrical analysis is characterized by simple analytic equipments,and convenient operating which has been widely used in the determination of rhodium in much kind of samples.However it is difficult to control the oxidation of rhodium that make the analytic result on the high side when burning the rhodium precipitation. We use centrifugal separation instead of filtrating separation and baking dry the rhodium precipitation instead of burning dry when using zinc reduction gravimetric analysis of rhodium.By doing so,the accuracy and precision of analysis are satisfactory,which can guard aginst the higher deviation from actual determination result brought by zinc reduction gravimetric analysis of rhodium.