Effect of the Nature of a Quaternary Ammonium Salt and the Addition of a Neutral Carrier on Analytical Characteristics of Sulfate-Selective Electrodes
- Authors: Matveichuk Y.V.1, Rakhman’ko E.M.1, Okaev E.B.1
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Affiliations:
- Faculty of Chemistry
- Issue: Vol 73, No 4 (2018)
- Pages: 374-382
- Section: Articles
- URL: https://journals.rcsi.science/1061-9348/article/view/183005
- DOI: https://doi.org/10.1134/S1061934818040081
- ID: 183005
Cite item
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.
About the authors
Yu. V. Matveichuk
Faculty of Chemistry
Author for correspondence.
Email: Yu_Matveychuk@mail.ru
Belarus, Minsk, 220030
E. M. Rakhman’ko
Faculty of Chemistry
Email: Yu_Matveychuk@mail.ru
Belarus, Minsk, 220030
E. B. Okaev
Faculty of Chemistry
Email: Yu_Matveychuk@mail.ru
Belarus, Minsk, 220030