Quantitative aspects of electrolysis in electromembrane extractions of acidic and basic analytes

Analytica Chimica Acta
Andrea ŠlampováPetr Boček

Abstract

Electrolysis is omnipresent in all electrochemical processes including electromembrane extraction (EME). The effects of electrolysis on quantitative aspects of EME were comprehensively evaluated for a set of acidic (substituted phenols) and basic (basic drugs) analytes. EMEs were carried out across supported liquid membranes formed by 1-ethyl-2-nitrobenzene at standard EME conditions, i.e., acidic analytes were extracted from alkaline into alkaline solutions and basic analytes were extracted from acidic into acidic solutions. Electric potential applied across the EME systems was 50 V and extraction recoveries of analytes as well as pH values of donor and acceptor solutions were determined after each EME. It has been proven that electrolysis plays a more significant role than has ever been thought before in EME. Electrolytically produced H(+) and OH(-) ions had a significant effect on pH values of acceptor solutions and variations of up to 8.5 pH units were obtained at standard EME conditions. pH values of donor solutions were affected only negligibly due to their significantly higher volumes. The observed variations in pH values of acceptor solutions had fatal consequences on quantitative EME results of weak and medium strong a...Continue Reading

References

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May 9, 2014·Electrophoresis·Astrid Gjelstad, Stig Pedersen-Bjergaard

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Citations

Dec 29, 2015·Journal of Chromatography. a·Andrea ŠlampováPetr Boček
Dec 4, 2015·Journal of Chromatography. a·Chuixiu HuangStig Pedersen-Bjergaard
Mar 18, 2016·Analytical Chemistry·Nicolas DrouinJulie Schappler
Nov 14, 2016·Talanta·Cristina Román-HidalgoMiguel Ángel Bello-López
Oct 1, 2015·Journal of Separation Science·Chuixiu HuangStig Pedersen-Bjergaard
Apr 7, 2019·Talanta·Cristina Román-HidalgoMiguel Ángel Bello-López
Mar 24, 2020·Analytical Chemistry·Frederik A HansenStig Pedersen-Bjergaard

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