Original title: Electrolysis in electromembrane extractions. Effects on extraction performance for substituted phenols
Authors: Šlampová, Andrea ; Kubáň, Pavel ; Boček, Petr
Document type: Papers
Conference/Event: CECE 2014. International Interdisciplinary Meeting on Bioanalysis /11./, Brno (CZ), 2014-10-20 / 2014-10-22
Year: 2014
Language: eng
Abstract: Electrolysis was shown to play a significant role in electromembrane extraction (EME) performance. Alkaline acceptors, prepared as 1 – 10 mM CsOH solutions, suffered from electrolytic reactions during EMEs of substituted phenols and their pH values decreased by more than 8 units after 40 min of EMEs at 50 V. As a consequence, serious deterioration of EME performance was observed for weak and medium-strong acidic phenols due to their compromised ionization and their subsequent back-extraction into organic phase and donor solution. Application of acceptor solutions consisting of high concentrations of weak bases (e.g. 500 mM ethanolamine) ensured similar initial pH conditions as for the alkali-metal hydroxide based solutions, moreover, significantly better tolerance to electrolysis-induced effects was obtained. Stable pH of acceptor solutions was achieved as well as an improved EME performance for all analytes over the entire extraction period.
Keywords: capillary electrophoresis; electrolysis; electromembrane extraction
Project no.: GA13-05762S (CEP)
Funding provider: GA ČR
Host item entry: CECE 2014. 11th International Interdisciplinary Meeting on Bioanalysis, ISBN 978-80-904959-2-0

Institution: Institute of Analytical Chemistry AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://www.ce-ce.org/CECE2014/CECE%202014%20proceedings_full.pdf
Original record: http://hdl.handle.net/11104/0241519

Permalink: http://www.nusl.cz/ntk/nusl-178330


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