A New Film Molybdate- and Tungstate-selective Electrodes Based on Higher QAS with Different Steric Accessibility of the Exchange Center Yu.V. Matveichuk*†, E.M. Rakhman’ko‡, V.V. Zhylko‡
	* Corresponding authors † Belarussian State University, Leningradskay, 14, 220030, Minsk, Belarus, ‡ Mogilev State University of Food Technologies, Shmidta, 3, 2120127, Mogilev, Belarus, *e-mail: Yu_Matveychuk@mail.ru
	Methods Objects Chem. Anal., 2017, 12(1), p. 24-30 https://doi.org/10.17721/moca.2017.24-30
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Abstract

The membranes composition of tungstate- and molybdate-selective electrodes based on higher QAS is optimized. It is found that the best analytical characteristics of electrodes are based on chloride 3,4,5-trisdodecyloxy)- benzyltrimethylammonium (TM) and chloride 4(3,4-dicetoxyphenyl)buthyltrimethylammonium (DCPBTM) with the addition in membranes of the solvating additive − n-heptyl ester 4-trifluoroacetylbenzoic acid. Their analytical characteristics: lower detection limits; selectivity coefficients relative to interfering chloride, sulfate, oxalate ions, molybdate and tungstate ions, respectively; working range of pH; slope of the electrode function are determined.

Keywords: tungstate- and molybdate-selective electrodes, quaternary ammonium salts

Article language: Rus