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Electrolysis in electromembrane extractions. Effects on extraction performance for substituted phenols
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SYSNO ASEP 0438022 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Electrolysis in electromembrane extractions. Effects on extraction performance for substituted phenols Author(s) Šlampová, Andrea (UIACH-O) RID
Kubáň, Pavel (UIACH-O) RID, ORCID
Boček, Petr (UIACH-O) RIDNumber of authors 3 Source Title CECE 2014. 11th International Interdisciplinary Meeting on Bioanalysis. - Brno : Institute of Analytical Chemistry AS CR, 2014 / Foret F. ; Křenková J. ; Drobníková I. ; Guttman A. ; Klepárník K. - ISBN 978-80-904959-2-0 Pages s. 394-396 Number of pages 3 s. Publication form Print - P Action CECE 2014. International Interdisciplinary Meeting on Bioanalysis /11./ Event date 20.10.2014-22.10.2014 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords electromembrane extraction ; electrolysis ; capillary electrophoresis Subject RIV CB - Analytical Chemistry, Separation R&D Projects GA13-05762S GA ČR - Czech Science Foundation (CSF) Institutional support UIACH-O - RVO:68081715 UT WOS 000354547400127 Annotation 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. Workplace Institute of Analytical Chemistry Contact Iveta Drobníková, drobnikova@iach.cz, Tel.: 532 290 234 Year of Publishing 2015 Electronic address http://www.ce-ce.org/CECE2014/CECE%202014%20proceedings_full.pdf
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