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Gas Diffusion Membrane Separation in Triangle-Programmed Coulometric Titrations

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Abstract

A simple method for the selective determination of ammonious nitrogen and cyanide by means of triangle-programmed coulometric titration in a flow through system is described. Ammonia and hydrogen cyanide are transferred across a gas permeable membrane. After absorbtion in a suitable acceptor stream ammonium and cyonide ions are titrated with electrolytically generated OBr- and I2 respectively. The titration curves are followed continuously with a biamperometric flow through detector as a function of time. Linear concentration dependence was found in the ranges of 100 ώg l-1 -50 mg l-1 NH3 and 100 ώg l -1 -40 mg l-1 CIST (r2≥0.999). The standard deviations at 135 ώg l-1 NH3 and at 120 ώg l-1 CN- are 3.1 and 2.8%, respectively.

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Authors and Affiliations

  1. Martin-Luther- Universität Halle, Sektion Chemie, Weinbergweg, 16, DDR, Hungary

    Uwe Spohn

  2. Institute for General and Analytical Chemistry Technical University, Budapest, Gellért tér 4, 1111, Hungary

    Géza Nagy & Ernó Pungor

Authors
  1. Uwe Spohn
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  2. Géza Nagy
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  3. Ernó Pungor
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Spohn, U., Nagy, G. & Pungor, E. Gas Diffusion Membrane Separation in Triangle-Programmed Coulometric Titrations. ANAL. SCI. 2, 431–437 (1986). https://doi.org/10.2116/analsci.2.431

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  • DOI: https://doi.org/10.2116/analsci.2.431

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