A differential pulse polarographic method for the determination of trace amounts of osmium(VIII) using a polarographic maximum wave.

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  • 微分パルスポーラログラフ法における極大波を用いる微量オスミウムの定量
  • ビブン パルス ポーラログラフホウ ニ オケル キョクダイハ オ モチイル ビ

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Abstract

A differential pulse polarographic method for the determination of trace osmium (VIII) is described. In the presence of about 2000-times Cys, osmium (VIII) in a 1.0 mol/dm3 hydrochloric acid solution exhibits a well-defined maximum wave, or peak at -0.85 V vs. SCE. The peak height in the presence of Cys was amplified about 1600-times. The peak height depends on the concentration of hydrochloric acid, and reaches its maximum in a concentration range of 0.75 to 1.25 mol/dm3. Concerning the existence of Cys, the maximum wave, or peak, was complicatedly controlled by the adsorption, catalytic, and/or kinetic currents. Although Ag+, Cd2+, Cu2+, Hg2+, Pb2+and Zn2+, which were highly affinitive with Cys, did not interfere with the osmium peak, an excess amount of Cu2+ did interfere. Osmium (VIII) was directly detected by this method over a concentration range of 8.0 × 10-10 to 2.7 × 10-7 mol/dm3 ; the detection limit was 3.5 × 10--10mol/dm3 (k =3).

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 46 (3), 169-174, 1997

    The Japan Society for Analytical Chemistry

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