硬质合金中镍和钴的连续测定

Continuous Determination of Nickel and Cobalt in Cemented Carbide

利用镍、钴的ＥＤＴＡ络合物在强碱性介质中有效稳定常数的不同，用钙盐返滴定的方法，对硬质合金中的镍、钴两元素进行连续测定。方法快速、准确，相对标准偏差小于２％，测定结果与标准值或经典的分离分别测定法的结果均基本相符。

In view of the difference of the effective stability constants of the EDTA complexes of Ni and Co in strong alkaline medium, a method has been developed to determine Ni and Co in cemented carbide continuously by residual titration with calcium salt The method is rapid,accurare and the relative standard deviation is less than 2%.The results are basically same to the standard value or to the results obtained by classical method which titrate Ni and Co respectively after precipitating separation.