鐵鋼中コバルトの存在に於けるニッケルの定量に就て
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概要
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The ordinary process for the determination of nickel in iron and steel is precipitation by Dimethylglyoxime. This method is very accurate in the presence of all other elements except cobalt. When more than traces of cobalt are present, the method must be slightly modified. of modifications, the one apparently in most general use is the Methods of U.S. Steel Corporation that is based upon the oxidation of cobalt by sodium or potassium chlorate in ammoniacal solution. By this method the author determined nickel in iron and steel in the presence of varying amounts of cobalt. And he found the fact that this is an excellent process giving good results when the amount of cobalt in the solution of the sample does not exceed about 0.02 grams but when it is in excess of this limit the precipitate of the nickel glyoxime obtained may not have its true scarlet color owing to the contamination with cobalt and iron and too high results are obtained. So any remedy for this effect of cobalt is necessary if the solution of the sample contains more than 0.02 grams of cobalt. Some experiments were made to study the methods applicable in such a case. and of these the following method proved most successful : - Proceed as for nickel as in the Methods of U.S. Steel Corporation obtaining the impure nickel precipitate. The precipitate is dissolved off the filter with nitric acid allowing the solution to run into the beaker in which the precipitate of nickel was made. Heat and destroy any remnant of dimethylglyoxime. Cool and make the solution ammoniacal. Boil and filter the iron hydroxide. The precipitated iron hydroxide willcarry out with it a small amount of nickel. This iron hydroxide is redissolved in hot I ; I nitric acid and again precipitated with ammonia. From the combined filtrate the pure nickel precipitate can readily be obtained.
- 社団法人日本鉄鋼協会の論文
- 1931-11-25
社団法人日本鉄鋼協会 | 論文
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