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A new sulfate-selective electrode and its use in analysis

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Abstract

The improvement of the steric accessibility of exchange centers of higher quaternary ammonium salts (QAS) by replacing several long-chain alkyl substituents at the nitrogen atom with methyl groups enhanced the selectivity of ion-selective electrodes (ISEs) based on the specified ion exchangers for the SO 2−4 ion up to six orders of magnitude in the presence of singly charged anions. This can be qualitatively explained by the specific features of ion pair formation between quaternary ammonium cations and singly and doubly charged anions. The effect of the steric accessibility of the QAS exchange center on the selectivity of ISEs is partially retained in the presence of a neutral anion carrier, hexyl p-trifluoroacetylbenzoate (HTFAB), which is used for enhancing the selectivity for the sulfate ion in the presence of singly charged anions. A sulfate-selective electrode with a reasonable selectivity for practical purposes was proposed. It is based on the HTFAB-higher QAS ion pair bearing three methyl substituents at the nitrogen atom. The ISE was used in the analysis of natural water.

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Authors and Affiliations

  1. Research Institute of Physicochemical Problems, Belarussian State University, ul. Leningradskaya 14, Minsk, 220050, Belarus

    V. V. Egorov & E. B. Okaev

  2. Department of Chemistry, Belarussian State University, ul. Leningradskaya 14, Minsk, 220050, Belarus

    V. A. Nazarov & T. E. Pavlova

Authors
  1. V. V. Egorov
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  2. V. A. Nazarov
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  3. E. B. Okaev
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  4. T. E. Pavlova
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Additional information

Original Russian Text © V.V. Egorov, V.A. Nazarov, E.B. Okaev, T.E. Pavlova, 2006, published in Zhurnal Analiticheskoi Khimii, 2006, Vol. 61, No. 4, pp. 416–422.

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Egorov, V.V., Nazarov, V.A., Okaev, E.B. et al. A new sulfate-selective electrode and its use in analysis. J Anal Chem 61, 382–388 (2006). https://doi.org/10.1134/S1061934806040150

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