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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081715%3A_____%2F14%3A00438022" target="_blank" >RIV/68081715:_____/14:00438022 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.ce-ce.org/CECE2014/CECE%202014%20proceedings_full.pdf" target="_blank" >http://www.ce-ce.org/CECE2014/CECE%202014%20proceedings_full.pdf</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

CB - Analytická chemie, separace

OECD FORD obor

—

Projekt

<a href="/cs/project/GA13-05762S" target="_blank" >GA13-05762S: Teorie, metodologie a vývoj progresivních chemických metod pro analýzu stopových složek a složitých vzorků kapilární elektroforézou.</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

CECE 2014. 11th International Interdisciplinary Meeting on Bioanalysis

ISBN

978-80-904959-2-0

ISSN

—

e-ISSN

—

Počet stran výsledku

3

Strana od-do

394-396

Název nakladatele

Institute of Analytical Chemistry AS CR

Místo vydání

Brno

Místo konání akce

Brno

Datum konání akce

20. 10. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—