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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:49 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Physics and Technology of Renewable and Alternative Energy Sources
Title:
Rapid and simultaneous determination of dihydroxybenzene isomers using a disposable electrochemically pretreated cobaltphthalocyanine modified pencil graphite electrode
Authors:
Andreea Alexandra RABINCA(1,2), Mihaela BULEANDRA(1), Ioan STAMATIN(2), Anton Alexandru CIUCU(1)
Affiliation:
1)University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry, 90-92 Panduri Avenue, 050663, Bucharest, Romania
2)University of Bucharest, Faculty of Physics, MG38-Magurele, Bucharest, Romania
E-mail
andreea.rabinca@gmail.com
Keywords:
dihydroxybenzene isomers, cobaltphtalocyanine, pencil graphite electrode, tea samples
Abstract:
Hydroquinone (HQ), catechol (CC), and resorcinol (RS) are dihydroxybenzene isomers often used in pesticides, medicines, cosmetics, flavoring agents, dyes, etc. They are considered as environmental pollutants by the US Environmental Protection Agency (EPA) and also by the European Union (EU) [1]. Therefore it is useful a simple and rapid method for the simultaneous determination of these 3 isomers.In this work it is proposed a novel assay for the simultaneous determination of HQ, CC and RS using an electrochemically pretreated disposable chemically modified pencil graphite electrode for the electrochemical characterization (using cyclic voltammetry ) and quantitative determination (using differential pulse voltammetry) of the 3 isomers. The detection and quantification limits obtained for the 3 izomers (from linear regression analysis) are: 0.10 × 10-6 M and 0.34 × 10-6 M for HQ, 0.31 × 10-6 M and 1.03 × 10-6 M for CC and 0.72 × 10-6 M and 2.41 × 10-6 M for RS, respectively. The proposed method was used for the determination of HQ, CC and RS in tea infusion samples. To avoid the possible effects due to matrix it was used the standard additions method. The method was used to detect the isomers in tea samples and the results obtained with the proposed method were compaired with the ones obtained by HPLC and were in good agreement. So it can be concluded that the proposed method using a disposable electrochemically pretreated can be applied succesfully for the simultaneous determination of HQ, CC and RS in tea samples.
References:
[1]. H. Yin, Q. Zhang, Y. Zhou, Q. Ma, T. liu , L. Zhu, S. Ai, Electrochemical behavior of catechol, resorcinol and hydroquinone at graphene–chitosan composite film modified glassy carbon electrode and their simultaneous determination in water samples, Electrochimica Acta 56 (2011) 2748–2753.
Acknowledgement:
The financial support of Romanian Grant no. 251/2011 entitled “Novel electrochemical microbiosensors based on bio-catalytical nano-structures for clinical diagnostic of patients with neuropsychiatric diseases” funded by UEFSCIDI is highly appreciated (PN-II-IDPCE-2011-3-0784) and Andreea Alexandra Rabinca gratefully thanks for financial support to the doctoral school from the University of Bucharest, Faculty of Physics.
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