Název: Electrolysis in electromembrane extractions. Effects on extraction performance for substituted phenols
Autoři: Šlampová, Andrea ; Kubáň, Pavel ; Boček, Petr
Typ dokumentu: Příspěvky z konference
Konference/Akce: CECE 2014. International Interdisciplinary Meeting on Bioanalysis /11./, Brno (CZ), 2014-10-20 / 2014-10-22
Rok: 2014
Jazyk: eng
Abstrakt: 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.
Klíčová slova: capillary electrophoresis; electrolysis; electromembrane extraction
Číslo projektu: GA13-05762S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: CECE 2014. 11th International Interdisciplinary Meeting on Bioanalysis, ISBN 978-80-904959-2-0

Instituce: Ústav analytické chemie AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný na externích webových stránkách.
Externí umístění souboru: http://www.ce-ce.org/CECE2014/CECE%202014%20proceedings_full.pdf
Původní záznam: http://hdl.handle.net/11104/0241519

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-178330


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav analytické chemie
Konferenční materiály > Příspěvky z konference