Influence of zncl2 concentration on the selectivity of a zn(ncs)4²--selective electrodes and its application for determination scn- ions in industrial solutions

• YU.V MATVEICHUK ^[1] ; E.M RAKHMAN'KO ^[2]
  1. [1] Mogilev State University of Food Technologies Chemico-Technological Faculty Department of Chemistry
  2. [2] Belarussian State University Faculty of Chemistry Department of Analytical Chemistry
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 62, Nº. 2, 2017, págs. 3478-3482
• Idioma: inglés
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• Resumen

  • 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 CKO4- ions and more than 4.5 orders of magnitude in the presence of interfering NO3- ions.