Spectrophotometric determination of copper in copper-niobium alloys using EDTA.

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  • DANZAKI Yûetsu
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

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Other Title
  • ＥＤＴＡによる銅‐ニオブ合金中の銅の吸光光度定量
  • EDTA ニ ヨル ドウ ニオブ ゴウキンチュウ ノ ドウ ノ キュウコウ コ
  • EDTAによる銅-ニオブ合金中の銅の吸光光度定量

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Abstract

Copper in copper-niobium alloys containing titanium or/and tantalum was spectrophotometrically determined as copper-EDTA complex without prior separation. Procedure : a sample (alloy below 400 mg, containing copper below 120 mg) was dissolved with 10 ml of HNO3 (30.5%) and 2 ml of HF (46%) in a platinum dish. After the addition of 20 ml of saturated boric acid solution, the solution was put into a beaker containing 1 ml of H2O2 (30%), and 10 ml of EDTA (10 w/v%) was then added to the solution. After adjusting the pH to 5.5 with NH4OH (25%), the solution was diluted to 100 ml with water in a volumetric flask. The absorbance of the final solution was measured at 730 nm against reagent blank.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 34 (10), T136-T139, 1985

    The Japan Society for Analytical Chemistry

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