金属ニッケル分析法の研究-10・11-

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The methods of the quantitative determination of cobalt in nickel metal by the potentiometric titration method, the light absorbancy method, and the spectrographic method have been investigated. In the potentiometric titration method, the oxidometric titration method by use of heretofore known potassium ferricyanide has been investigated ; and the best conditions for removing disturbing influences, such as disturbing elements, oxidation by air and temperature, have been found for the accurate determination. In the light absorbancy method, various conditions for a direct extraction of cobalt as a antipyrine-thiocyanic acid complex salt with organic solvent from the nickel solution as well as the method for controlling of disturbing elements have been investigated and a satisfactory method has been found. In the spectrographic method, the sample solution containing nickel is absorbed in a carbon electrode and the methods of determination by use of an arc from alternating current have been investigated, in which the multi-line method gives a satisfactory result for the rapid determination.<BR>A direct method of the determination of purity of high quality nickel metal has not been found up to this time. Although the electrolytic method has more merit than the other methods for the determination of nickel, methods known heretofore were found to be unsatisfactory for the determination of purity of high quality nickel metal. The greatest difficulty in the usual electrolytic method in ammoniac solution is an abnormally excessive deposition ; the studies on this problem have been very few and no satisfactory solution to overcome this difficulty has been found. Electrolytic studies of ammoniac solution in this experiment indicated that there were some other cause of the excessive deposition besides the excessive deposition caused by the adsorption of hydrogen gas at low temperature. In order to clarify this mechanism and overcome the difficulties, fundamental experiments were carried out in order to prove the consumption of platinum anode and its deposition on the cathode in the electrolysis of ammoniac solution. The quantitative determination of a small amount of platinum, nickel and cobalt in electro-deposit and residual electrolyte, as well as the efficiency of depolarizers, were investigated.
社団法人日本分析化学会の論文

金属ニッケル分析法の研究-10・11-

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