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目前,测定金属钴和氧化钴中的微量镍均是采用丁二酮肟法,其灵敏度低、手续较繁。而杂环偶氮化合物类的pAN,其灵敏度较高。我们在Lassner、Wada等的工作基础上,进一步研究了Ni~(2+)-PAN络合物的形成和萃取的适宜条件,它的分光光度特征及络合物的组成。而基体钴的除去,则采用甲基异丁酮(MIBK)萃取兰色的(NH_4)_2[Co(SCN)_4]法。据此拟定了金属钴、氧化钴中微量镍的测定新方法。
At present, the determination of trace amounts of nickel metal cobalt and cobalt oxide are dimethylglyoxime method, its low sensitivity, more complicated procedures. The heterocyclic azo compounds pAN, its higher sensitivity. Based on the work of Lassner and Wada et al, we further studied the suitable conditions for the formation and extraction of Ni ~ (2 +) - PAN complex, its spectrophotometric characteristics and the composition of the complex. The substrate cobalt removal, the use of methyl isobutyl ketone (MIBK) extraction of blue (NH_4) _2 [Co (SCN) _4] method. Based on this, a new method for the determination of trace nickel in metallic cobalt and cobalt oxide was developed.