金属ニッケル分析法の研究-7・8-

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A method for colorimetric determination of a small amount of manganese in metallic nickel is investigated. The sample is dissolved in nitric acid, a minute amount of manganese is separated from nickel by coprecipitating with ferric hydroxide in ammonical solution, and determined colorimetrically by oxidation to permanganate using silver nitrate and ammonium persulfate in acidic solution. The effects of other impurities which may be present in metallic nickel are reported along with methods for preventing the interferences.<BR>A method for colorimetric determination of a small amount of silicon in metallic nickel is investigated by means of ammonium molybdate-amyl alcohol extraction. This paper deals with the results of studies of a simultaneous extraction of molybdosilicic acid, molybdophosphoric acid and molybdoarsenic acid from the nickel solution into amyl alcohol, and the extraction of only molybdosilicic acid from amyl alcohol into sodium hydroxide-boric acid buffer solution. Optimum conditions of reagent concentration, acidity for coloring and extraction, and the temperature and alkalinity of buffer solution are determined. Interferences with other impurities that may be present in nickel are shown to be negligible. The minimum limit of quantitative estimation of silicon is 0.0002%.
社団法人日本分析化学会の論文