金属ニッケル分析法の研究-9-

概要

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A colorimetric determination of a small amount of Zinc in metallic nickel by the monochromatic method from its dithizone-carbon tetrachloride extract has been investigated. Although zinc can be extracted from its slightly acidic solution by dithizone-carbon tetrachloride and color is red, nickel is also extracted at the same time. Therefore, the extraction of nickel in this case is controlled by the addition of potassium cyanide. However, the presence of large amount of nickel cyanide in this case caused a considerable disturbance on the extraction of zinc, and improvements of this problem have been investigated. Conditions for colorimetric determination of zinc in the presence of 500 mg nickel have been found. The lower limit of determination by this method is 0.0001%, and the time required for analyses of a set of 10 samples is 3 hours.
社団法人日本分析化学会の論文