Spectrophotometric determination of vanadium(V) with 8-quinolinol in the presence of non-ionic surfactant.

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Other Title
  • 非イオン界面活性剤存在下８‐キノリノールによるバナジウム（Ｖ）の吸光光度定量
  • ヒ イオン カイメン カッセイザイ ソンザイカ 8 キノリノール ニ ヨル バ
  • 非イオン界面活性剤存在下8-キノリノールによるバナジウム(V)の吸光光度定量

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Abstract

Vanadium(V) formed a water soluble complex with 8-quinolinol (HL) in the presence of Triton X-100 at pH 3.2, showing two absorption maxima at 410 nm and 530 nm. Then the black-red color development was applied to the spectrophotometric determination of vanadium(V). Recommended procedure is as follows: To less than 400μg of vanadium(V) in an acidic medium, add 5 cm3 of Triton X-100 solution (0.12 g cm-3) and 2.0 cm3 of 8-quinolinol solution (9.6×10-2 mol dm-3). Adjust pH to 3.2 with sodium acetate solution (1 and 0.2 mol dm-3) and dilute to 20 cm3 with water. Heat for 10 min in a water bath at 60°C, cool to room temperature with water and dilute to 25.0cm3 with water. Measure the absorbance at 530 nm against the reagent blank. Beer's law was valid over the range of 0.416 ppm of vanadium(V). The molar absorptivity at 530 nm was 2.9×103 dm3 mol-1 cm-1. Up to 10 mg of Ca(II), Mg(II), Mn(II), Cd(II), Pb(II), 5 mg of Ni(II), Co(II), Zn(II), Al (III), 2 mg of Mo(VI), 0.5 mg of Cr(III), 0.2 mg of W(VI), and 0.1 mg of Ti(IV) did not interfere. Interference from less than 50 mg of Fe(III) and Cu(II) was removed as precipitate of their 8-quinolinolates from its alkaline solution in the range of pH 1011. It was considered that the complex showing the absorption maximum at 530 nm was VO(OH)L2.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 34 (9), 564-567, 1985

    The Japan Society for Analytical Chemistry

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