Separation of Lead and Zinc Using a Flow-Through Electrochemical Cell and Their Simultaneous Spectrophotometric Determination

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  • WATANABE Kunihiro
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • KATOU Youhei
    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
  • フロー電解分離法による鉛と亜鉛の同時吸光光度定量
  • フロー デンカイ ブンリホウ ニ ヨル ナマリ ト アエン ノ ドウジ キュウコウ コウド テイリョウ

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Description

A novel flow-through electrochemical cell, used to concentrate and separate successively lead(II) and zinc(II) ions, has been developed. The working electrode potential can be controlled by the solution resistance of the present electrochemical cell, which is a stepladder type. The flow channel between the working and counter electrodes in the cell is made of a PTFE tube (inner diameter 1.0 mm). The potential gradient on the working electrode depends on the PTFE tube length. After lead and zinc were deposited at −0.1 V and −1.0 V vs. SSE, respectively, on a working electrode of platinum wire for 20 min, they were eluted from the working electrode for 3 min at + 1.0 V. The sample solutions, involving zinc(II) and lead(II) ions, were prepared with distilled water and sodium perchlorate as a supporting electrolyte. The zinc(II) and lead(II) ions dissolved from the working electrode were determined with 4-(2-pyridylazo)-resorcinol (PAR) by spectrophotometry at a wavelength of 520 nm. The calibration curve for the zinc(II) ion was linear at a concentration below 100 ppb. The determination limit of zinc was 4 ppb using 1 ml of the sample solution. On the other hand, the calibration curve between the absorbance and the lead concentration was not straight, but the calibration curve between the lead concentration and the peak area was linear over the concentration range below 1000 ppb.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (2), 121-126, 2005

    The Japan Society for Analytical Chemistry

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