アルセナゾIIIによる鉄鋼中トリウムの吸光光度定量法

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タイトル別名
  • Spectrophotometric Determination of Thorium in Iron and Steel with Arsenazo III
  • アルセナゾ III ニ ヨル テッコウ チュウ トリウム ノ キュウコウ コウド テイリョウホウ

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Quantitative determination of thorium in iron and steel by the spectrophotometric method using arsenazo III has been investigated.<BR>Thorium-arsenazo III complex showed maximum absorbance at 665 mμ and the concentration of HCl did not affect the determination at 4∼7 N. The interference by zirconium complex with arsenazo III could be eliminated by adding oxalic acid and was masked most effectively in a 2.5 N HCl medium. The coloration followed Beer’s law over the range of 0∼30 μg thorium at 2.5 N HCl in 50 mL for 30 mm cell. Up to 10 mg Al3+, 20 mg Fe3+, 3 mg Ni2+ and 1 mg Pb2+ didn’t interfere the determination of thorium.<BR>The method of determination is as follows:<BR>The sample, after decomposition with mixed acid and perchloric acid, can be treated for the separation of iron and other metals by magnetic electrolysis with the use of a mercury cathode. The solution is diluted exactly to 250 mL and an aliquot is taken. After evaporating, dissolve the residue in 10 mL of HCl(1+1) and transfer to a 50 mL volumetric flask. Add 14 mL of saturated oxalic acid in HCl(1+1), 15 mL of 4% oxalic acid solution, ascorbic acid to reduce the iron (III) and 5 mL of 0.05% solution of arsenazo III and dilute to the mark with water. The photometric determination is carried out at 665 mμ in 30 mm cell. The thorium content is found via a calibration curve.<BR>By this means, 0.010% thorium in iron and steels could be determined with satisfactory results.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (10), 619-622, 1964

    公益社団法人 日本金属学会

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