The Photometric Determination of the Trace Amount of Boron in Iron and Steel

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  • クルクミンによる鉄鋼中の微量ホウ素の吸光々度定量法
  • クルクミン ニ ヨル テッコウ チュウ ノ ビリョウ ホウソ ノ キュウコウクリカエシド テイリョウホウ

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Abstract

Following the previous paper, the various conditions required for the quantitative separation of boron from the other components in iron and steel, involved in methyl alcohol distillation and the fixation of boron in the distillate, were investigated. The following results were obtained. (1) The distillate should be kept in a closed vessel, because boron in distillate (as methylester) volatilized propertionaly with the time allowed to contact with flowing atmosphere, even at room temperature. (2) For fixation of boron in the distillate, the concentration of the sodium hydroxide solution should be 0.2 N at minimum, because boron tended to volatilize faster as the concentration of sodium hydroxide solution decreased. (3) A mixture of phoshoric acid and sulphuric acid was an effective solvent for iron and steel samples, especially for those of heat-fesisting steel and alloy, for the preven tion of loss of boron through the foaming of solution when methyl alchol was added. (4) In order to distill boron quantitatively from the mixture of phosphoric acid and sulphuric acid, sufficient cooling of the methyl alcohol vapour containing boron and the distillation until the distillate amounted to 25 mL after the addition of 40 mL of methyl alcohol were required. On the basis of these results and those of the previous paper the photometric method for the determinations of the trace amount of boron was established and satisfactory results were obtained by the application of this method to standard N.B.S. steels and some heat-resisting steels and alloys.

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