Spectrophotometric Determination of Small Amounts of Cadmium (II) Using Formation of Zinc (II) Complex with Anionic Porphyrin as an Indicator Reaction

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  • Watanabe Kunihiro
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Okajima Akiko
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Shitanda Isao
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Itagaki Masayuki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science

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Other Title
  • 亜鉛（ＩＩ）とアニオン性ポルフィリンの錯生成を指示反応とする微量カドミウム（ＩＩ）の吸光光度定量
  • 亜鉛(2)とアニオン性ポルフィリンの錯生成を指示反応とする微量カドミウム(2)の吸光光度定量
  • アエン 2 ト アニオンセイ ポルフィリン ノ サクセイセイ オ シジ ハンノウ ト スル ビリョウ カドミウム 2 ノ キュウコウ コウド テイリョウ

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Abstract

Cadmium(II) ion has been sensitively determined with water-soluble porphyrin by spectrophotometry. However, the conventional method required a removal procedure for zinc and lead before an analysis of cadmium. Some kinds of pretreatments for the removal of interference ions, which was a solvent-extraction or co-precipitation procedure, were complicated. Therefore, a simple and easy removal method for lead and zinc interference has been investigated. The interference of zinc was avoided by using a large amount of zinc as a metal component for an indicator reaction between Zn and TPPS. As the result of a search on some removal procedures, we have found that a masking agent is effective for the removal of lead interfere. Lead (II) was masked with Bis-Tris using as a Good pH buffer reagent. This method was a batch procedure by controlling the reaction time, temperature, light and others. The optimum conditions by the present method were as follows : sample solution 70 mL ; TPPS (3.0 × 10−6 mol/L); Bis-Tris (10−2 mol/L); Zn, 4 ppm ; pH, 8.0 ; temperature, 25°C ; reaction time, 5 min ; and measurement wavelength 422.5 nm. The calibration curve was liner over the range of 0 to 100 ppb. The determination limit of cadmium was 1.6 ppb. The RSD of 10 ppb cadmium was 1.4%. Zinc(II) and lead (II) were tolerated up to 2 ppm and 0.5 ppm. The proposed method was applied to the determination of a soil standard sample.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 59 (7), 589-595, 2010

    The Japan Society for Analytical Chemistry

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