HClO_4 によるフ***マンガン中のマンガン迅速定量法

概要

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As the methods of utilizing HClO_4 in rapid analysis of iron and steel, we have studied on the determination of Mn in Ferro-Manganese. Outlines of the procedure are as follows : - (1) Sample (0.2g) is dissolved in hot HClO_4 (10c.c.). (2) H_3PO_4 (10c.c.) is added to it and heating is continued. (3) 30c.c. of H_2SO_4 (1 : 1) is added to it. (4) The solution is diluted by adding about 250c.c. of H_2O (5) After cooling, it is titrated by N/10 Fe"-N/10 KMnO_4 sol. The characteristics of this method are as follows : - (1) The rapidity of dissolving samples with HClO_4 and the violent oxidation of it are utilized. (2) Mu^<II> is oxidized into Mn^<III> by HClO_4 under the existence of H_3PO_4 and yet Mn^<III> is stable in H_2SO_4 acidic solution. (3) And also, as it is titrated by Fe^<II>-KMnO_4 method, the end point can be clearly recognized. (4) Accurate results are obtained within 12∿18 minutes because of the simplicity of procedure.
社団法人日本鉄鋼協会の論文
1949-07-25