クルクミンによる微量ホウ素の吸光々度法

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タイトル別名
  • The Photometric Determination of the Trace Amount of Boron with Using Curcumin
  • クルクミン ニ ヨル ビリョウ ホウソ ノ キュウコウクリカエシドホウ

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抄録

It was attempted, at first,to apply the photometric method with using curcumin for determination of trace amounts of boron in iron and steel, especially heat-resisting steel and alloy. However, the application of the conventional method usually gave fluctuating unstable results because of the unstable nature of alcoholic reagent solution, the adsorption of coloured complex by the dried residue and the continuous variation in atmospheric humidity. Therefore, in the present investigation, the conditions to develop colour with boron by using acetone reagent solution were investigated. Some modifications shown below were adopted. (1) The constant atmospheric humidity surrounding dried residue was maintained throughout the procedure. (2) M.I.B.K. and water were adopted as extractants and sodium hydroxide or sodium carbonate to form soluble salt as fixing agent for boron in order to prevent the turbidity and the decrease in the absorbancy of the coloured complex solution and for the complete recovery of the coloured complex adsorbed by dried residue. (3) In place of the conventional hydrochloric acid+water (1+4) mixture, a hydrochloric acid+ethylacetate (1+2) mixture was used as the accelerator for the development of colour to improve the reliability of the results, to increase the absorbancy of coloured complex and to reduce the duration of evaporation. As a result of these modifications, the reliable results were obtained reproducibly and the conditions to develop the colour for boron were securely established.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (8), 535-539, 1961

    公益社団法人 日本金属学会

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