Electrolysis in electromembrane extractions. Effects on extraction performance for substituted phenols

0438022 - ÚIACH 2015 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Šlampová, Andrea - Kubáň, Pavel - Boček, Petr
Electrolysis in electromembrane extractions. Effects on extraction performance for substituted phenols.
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.), s. 394-396. ISBN 978-80-904959-2-0.
[CECE 2014. International Interdisciplinary Meeting on Bioanalysis /11./. Brno (CZ), 20.10.2014-22.10.2014]
Grant CEP: GA ČR(CZ) GA13-05762S
Institucionální podpora: RVO:68081715
Klíčová slova: electromembrane extraction * electrolysis * capillary electrophoresis
Kód oboru RIV: CB - Analytická chemie, separace
http://www.ce-ce.org/CECE2014/CECE%202014%20proceedings_full.pdf

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.
Trvalý link: http://hdl.handle.net/11104/0241519