Determination of Ferrous Oxide and Ferric Oxide in the Presence of Trivalent and Tetravalent Manganese Oxide

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  • 三価および四価の酸化マンガンと共存する酸化第一鉄および酸化第二鉄の定量法
  • 3カ オヨビ 4カ ノ サンカ マンガン ト キョウソン スル サンカ ダイ1テツ オヨビ サンカ ダイ2テツ ノ テイリョウホウ

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Abstract

No reliable method has been developed for the determination of iron in the state of ferrous oxide coexisting with ferric oxide and trivalent and tetravalent manganese oxides in an ore sample. The ordinary method of dissolving a sample with hydrochloric or sulfuric acid is not suitable to determine the ferrous iron of manganese ore, either, because of the oxidation of ferrous oxide by chlorine or oxygen, produced during the sample solution. After some experiments, the recommended procedure for the above purpose was decided as follows: A 0.2 g sample is dissolved in a mixed solution of 10 mL of 20% sodium sulfite and 30 mL of (1+1) phosphoric acid, passing carbon dioxide through it on a boiling water bath, then the solution is transfered to a heater to decompose the excess of sodium sulfite by approximately 10 minutes boiling. The flask is cooled and the ferrous iron in the solution is titrated with N/50 ammonium metavanadate solution with diphenyl amine as an indicator. The ferric oxide is given, by subtracting the ferrous oxide thus obtained from the total iron of the sample, previously determined by means of the stannous chloride reduction-permanganate titration method.

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