マンガン鐵中の燐迅速分析法の研究

概要

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The rapid method for determining phosphorus in iron and steel by centrifugal method developed formerly by one of the authors was applied to rapid determination of phosphorus in ferromanganese, and satisfactory results were obtained in about ten minutes. The procedure is as follows : After transferring 0.1 gram of sample to a 100 cc conical or egg-plant shaped flrask, dissolving it in about 10 cc of HNO_3 (1 : 1) (or 5 cc of conc. HNO_3 when sample is not finer than 100 mesh), and boiling to expel oxides of nitrogen, filter the solution. Then washing with a little quantity of water, oxidizing by adding KMnO_4 (2%), boil it to form brown pricipitate of hydrated manganese dioxide. Dissolving the precipitate by adding one or two drops of H_2O_2, saturated oxalic acid solution or FeSO_4 (5%), boil it. After adding 20 cc of molybdate reagent, stoppering the flask, and shaking it vigorously for 1 minute, transfer to special small centrifuge tube with P% graduation on its capillary without washing. The volume of the solution should now be about 30 cc. After centrifuging at 2000 r.p.m. for 1 minute, removing the tube from the machine, read the percentage of phosphorus directly on the capillary.
社団法人日本鉄鋼協会の論文
1951-02-25