Simple Spectrophotometric Determination of Trace Amounts of Zinc in Environmental Water Samples Using Aqueous Biphasic Extraction

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  • Shibukawa Masami
    Graduate School of Science and Engineering, Saitama University
  • Shirota Daisuke
    Graduate School of Science and Engineering, Saitama University
  • Saito Shingo
    Graduate School of Science and Engineering, Saitama University
  • Nagasawa Shin
    Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Saitoh Kazunori
    Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Minamisawa Hiroaki
    Department of Liberal Arts and Basic Science, College of Industrial Technology, Nihon University

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Other Title
  • 水性二相抽出を用いる環境水中の微量亜鉛の簡易吸光光度定量
  • 年間特集「水」 水性二相抽出を用いる環境水中の微量亜鉛の簡易吸光光度定量
  • ネンカン トクシュウ ミズ スイセイ ニソウ チュウシュツ オ モチイル カンキョウ スイチュウ ノ ビリョウ アエン ノ カンイ キュウコウ コウド テイリョウ

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Abstract

A simple and highly selective and sensitive extraction spectrophotometric method is presented for the determination of trace amounts of zinc in environmental water samples. The method is based on the separation and preconcentration of zinc as its thiocyanate complex by aqueous biphasic extraction and subsequent determination by spectrophotometry. As a chromogenic reagent for the spectrophotometric determination of zinc, 5-(5-Bromo-2-pyridylazo)-5-[N-n-propyl-N-(3-sulfopropyl)amino]-phenol (5-Br-PAPS) was used. Aqueous biphasic extraction can be performed by dissolving polyethylene glycol and sodium sulfate in a water sample. A rapid phase separation technique for this aqueous biphasic system was developed using thermal convection so that the extraction of zinc can be accomplished within 7 minutes without mechanical centrifugation. The calibration curve is linear in the concentration range of 0∼200 μg L−1 and the determination limit calculated with ten-times the standard deviation of the reagent blank value is 1.6 μg L−1. Interferences from foreign metal ions were removed by separation with aqueous biphasic extraction and masking with suitable reagents for individual metal ions. The proposed method was applied to the determination of zinc in tap water and river water samples. The obtained results were in good agreement with those obtained by inductively coupled plasma atomic emission spectrometry.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 59 (10), 847-854, 2010

    The Japan Society for Analytical Chemistry

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