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Micro volume voltammetric determination of 4-nitrophenol in dimethyl sulfoxide at a glassy carbon electrode
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SYSNO ASEP 0485559 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Micro volume voltammetric determination of 4-nitrophenol in dimethyl sulfoxide at a glassy carbon electrode Tvůrce(i) Gajdar, J. (CZ)
Barek, J. (CZ)
Fojta, Miroslav (BFU-R) RID, ORCID
Fischer, J. (CZ)Celkový počet autorů 4 Zdroj.dok. Monatshefte fur Chemie. - : Springer - ISSN 0026-9247
Roč. 148, č. 9 (2017), s. 1639-1644Poč.str. 6 s. Jazyk dok. eng - angličtina Země vyd. AT - Rakousko Klíč. slova square-wave voltammetry ; nitrobenzene Vědní obor RIV CE - Biochemie Obor OECD Biochemistry and molecular biology Institucionální podpora BFU-R - RVO:68081707 UT WOS 000407126500012 DOI 10.1007/s00706-017-1954-4 Anotace This study presents a miniaturized instrumentation for the determination of a model electrochemically reducible compound, 4-nitrophenol, in micro volumes of dimethyl sulfoxide at the glassy carbon electrode. Several working configurations of a three-electrode system and different constructions of reference electrodes are described. Moreover, the problem of the removal of oxygen (which is rather difficult in micro volumes) complicating the determination by differential pulse voltammetry, especially in a cathodic potential range was successfully solved. It has been found that the interference of oxygen can be partly eliminated by square wave voltammetry which is less sensitive to the presence of oxygen in the sample. Special apparatus capable of removing dissolved oxygen from 20 mm(3) of solution was also constructed and tested. It was verified that 4-nitrophenol can be determined in micro volumes of dimethyl sulfoxide by square wave voltammetry in the presence of dissolved oxygen (limit of quantification LOQ = 6.0 mu mol dm(-3)) and by differential pulse voltammetry after the removal of dissolved oxygen (LOQ = 2.4 mu mol dm(-3)). Both those methods are comparable with the determination in a macro volume (5.0 cm(3)), which has LOQ = 1.3 mu mol dm(-3). Pracoviště Biofyzikální ústav Kontakt Jana Poláková, polakova@ibp.cz, Tel.: 541 517 244 Rok sběru 2018
Počet záznamů: 1