金属ニッケル分析法の研究-4-

概要

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For determination of a minute amount of iron in nickel metal, colorimetric method by means of 2, 2'-bipyridyl was adapted. Since Al3+ has no influence upon the coloration of Fe2+-2, 2'-bipyridyl, coprecipitation method of Fe(OH)3 and Al(OH)3 was used in order to separate a small amount of iron from nickel and other impurities. The lower limit of this determination is found to be 0.0005%, and it may be reduced to 0.0001% by increasing the amount of sample to 5g. The precision of analysis or the coefficient of variation has proved to be about 5%. Statistical comparison of samplings by boring method and shaper method indicated that the latter method with the use of Igetalloy bit gave better result, since finely powdered iron was produced by the abrasion of drill in the former method and the sample was contaminated with the iron.
社団法人日本分析化学会の論文