鐵鋼中の砒素迅速定量法に就て

概要

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Ordinarily, the distillation method (JES) is used for analysis of arsenic in iron and steel with very excellent results, but it is not fit for the rapid annlysis on account of the long time being required for vaporization, drying and distillation. Therefore, the authors studied on the rapid and simple method. Outline of the procedure is as follows : - (1) Sample (2g) is dissolved by mixed acid solution. (2) The combined carbon and the arsenous As^<III>) are oxidized by KMnO_4 sol. and the excess KMnO_4 is reduced by H_2O_2 (3%) solution. (3) This is slowly poured into a boiling NaOH (20%) solution by stirring and cool down. (4) It is diluted to exactly 200c.c., mixed throughly, and filtrated by the dry filter paper. Finally, 50c.c. of this filtrate is pipetted off. (5) 50c.c. of conc.HC1 were added to it and cooled down. And then thereto are added 1c.c. of N/50 KBrO_3 solution and 10c.c. of KI (20%) solution to it. (6) Immediately, the I_2 set free is titrated with N/50 Na_2S_2O_3 solution.
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