アルカリ融解-電量滴定法による鋼中化合物型窒素定量法

概要

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The alkali fusion-coulometric titration method has been studied for the determination of nitrogen as nitride in steel. (1) The procedure, which has been established by using nitride reagent, is as follows. a) The nitride reagent is fused by molten alkali (450℃) containing water vapor. b) Nitrogen in the reagent is extracted as ammonia with carrier gas (Ar) and the ammonia is determined by the coulometric titration method. All nitrides excepting Cr_2N, ZrN can be determined by this method. (2) This method was applied for the determination of nitrogen in the residues extracted by 15%I_2-methanol decomposition method for steel. The results are as follows. a) The determination is completed within 20 min. b) Nitrogen blank of this method is very small. (0-2μg) c) The trace amount of nitrogen as nitride can be determined with excellent precision. (N=7 ppm C. V.=4∿5%)
社団法人日本鉄鋼協会の論文
1988-10-01