JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 62 No 2 (2017): Journal of the Chilean Chemical Society
Original Research Papers

INFLUENCE OF ZNCL2 CONCENTRATION ON THE SELECTIVITY OF A ZN(NCS)4 2–-SELECTIVE ELECTRODES AND ITS APPLICATION FOR DETERMINATION SCN− IONS IN INDUSTRIAL SOLUTIONS

Yu V. Matveichuk
Department of Chemistry, Chemico-Technological Faculty, Mogilev State University of Food Technologies
E. M. Rakhman’ko
Department of Analytical Chemistry, Faculty of Chemistry, Belarussian State University
Published June 16, 2017
Keywords
  • Potentiometry,
  • Thiocyanate ions,
  • Tetrathiocyanozincate−selective electrode,
  • Quaternary ammonium salts
How to Cite
Matveichuk, Y. V., & Rakhman’ko, E. M. (2017). INFLUENCE OF ZNCL2 CONCENTRATION ON THE SELECTIVITY OF A ZN(NCS)4 2–-SELECTIVE ELECTRODES AND ITS APPLICATION FOR DETERMINATION SCN− IONS IN INDUSTRIAL SOLUTIONS. Journal of the Chilean Chemical Society, 62(2). Retrieved from https://jcchems.com/index.php/JCCHEMS/article/view/190

Abstract

The influence of the background concentration of ZnCl2 on the selectivity of Zn(NCS)4

2–−SE based on QAS to SCN− is studied. The introduction of ZnCl2 into a solution fixes zinc released from the membrane in the form of thiocyanate complex. A high selectivity of the Zn(NCS)4 2–−SE to SCN− ions is due to the formation of better extractable complexes between zinc and SCN− compared to acidocomplexes of competitive anions. An introduction of 5.0 M ZnCl2 into a solution increases selectivity to SCN− ions by 5 orders of magnitude in the presence of interfering ClO4 − ions and more than 4.5 orders of magnitude in the presence

of interfering NO3 − ions.

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