鉄鋼およびフェロマンガン中のマンガンの定量法（第1報）鉄鋼中のマンガンの定量法

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  • Determination of Manganese in Iron, Steel and Ferromanganese (1st Report). Determination of Manganese in Iron and Steel

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The suitable concentration of acids and other conditions in ferrous-permanganate method after oxidation with persulfate for the determination of Mn in iron and steel were studied and the following results were obtained: (1) Acid concentration: using 2 g of (NH4)2S2O8 in total volume of 200 mL, Mn was determined in the concentration range of 1.2∼2.4 N H2SO4, 0.53∼1.20 N HNO3 and 0.6∼1.2 N mixed acid of H2SO4 and HNO3(3:1) but Mn could not be determined in acidic solution with HClO4. (2) Boiling time: the time for boiling of the solution for oxidation of Mn by (NH4)2S2O8 using AgNO3 was 5 min., causing the decomposition of permanganic acid. (3) Influence of H3PO4: when 1 g of Fe and 10 mg of Mn were present, the existence of 4 mL of H3PO4 (Sp. Gr 1.7) was preferable. (4) The suitable procedure for the determination of Mn in iron and steel was established and the analysis was carried out with several sample and good results were obtained.

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