Abstract
A film polyvinyl chloride sulfate-selective electrode based on the sterically accessible higher quaternary ammonium salt, 3,4,5-tris(dodecyloxy)benzyl(oxyethyl)3trimethylammonium chloride, using 1-bromonapthalene as a plasticizer and heptyl p-trifluoroacetylbenzoate as a solvating agent was developed. The limit of detection of the electrode was 6.7 × 10−7 M, lifetime was 1 month, and the slope of the electrode function was 27 mV/decade. The electrode is selective in the presence of interfering Cl−, C2O4−, Br−, and NO3−ions. The interference of carbonate ions was eliminated by maintaining pH at 3.2 ± 0.1. Based on IR spectroscopic and potentiometric studies, it is most likely that the solvation of sulfate ions with heptyl p-trifluoroacetylbenzoate occurs through interaction with the trifluoroacetyl carbonyl carbon atom rather than with hydroxyl groups of the hydrate form.
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Original Russian Text © Yu.V. Matveichuk, E.M. Rakhman’ko, E.B. Okaev, 2018, published in Zhurnal Analiticheskoi Khimii, 2018, Vol. 73, No. 4, pp. 289–297.
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Matveichuk, Y.V., Rakhman’ko, E.M. & Okaev, E.B. Effect of the Nature of a Quaternary Ammonium Salt and the Addition of a Neutral Carrier on Analytical Characteristics of Sulfate-Selective Electrodes. J Anal Chem 73, 374–382 (2018). https://doi.org/10.1134/S1061934818040081
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DOI: https://doi.org/10.1134/S1061934818040081