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化学分析法测定金属镍中0.3％以上的钴,笔者认为以新钴试剂最佳,可以不经任何分离手续而直接显色测定,但是,单个发色镍量不得超过7毫克。因此,镍中更低含量的钴,均需要萃取及反萃取分离镍或富集钴,手续冗长繁琐。本文在前人工作基础中,采用了丁二肟沉淀镍,并发现加大亚硝酸钾及盐酸羟胺的用量,可使钴的催化极谱波更加灵敏,由此拟定了简便测定金属镍中0.0005％以上钴的方法。本法速度快,成本低,灵敏度高,相对误差不超过20％,回收率90％以上。
Chemical analysis of nickel in the determination of more than 0.3% of cobalt, I believe that the best new cobalt reagent, can be directly without any separation procedures and direct determination of color, however, a single color of nickel should not exceed 7 mg. Therefore, a lower nickel content of cobalt, both need to extract and extract the separation of nickel or cobalt enrichment, lengthy and cumbersome procedures. In this paper, based on the previous work, the use of butane dioxime precipitated nickel, and found that increasing the amount of potassium nitrite and hydroxylamine hydrochloride cobalt catalytic polarographic wave can be more sensitive to the preparation of a simple determination of nickel 0.0005 % Of the above cobalt method. This method is fast, low cost, high sensitivity, the relative error of not more than 20%, the recovery rate of 90%.