title: Effect of cobalt doping level of ferrites in enhancing sensitivity of analytical performances of carbon paste electrode for simultaneous determination of catechol and hydroquinone.
abstract: This work presents the simultaneous determination of catechol (CC) and hydroquinone (HQ), employing a modified carbon paste electrode (CPE) with ferrite nanomaterial. Ferrite nanomaterial was doped with different amount of cobalt and this was investigated toward simultaneous oxidation of CC and HQ. It was shown that this modification strongly increases electrochemical characteristics of the CPE. Also, electrocatalytic activity of such materials strongly depends on the level of substituted Co in the ferrite nanoparticles. The modified electrodes, labeled as CoFerrite/CPE, showed two pairs of well-defined redox peaks for the electrochemical processes of catechol and hydroquinone. Involving of ferrite material in the structure of CPE, cause increase in the potentials differences between redox couples of the investigated compounds, accompanied with increases in peaks currents. Several important parameters were optimized and calibration curves, with limits of detection (LOD) of 0.15 and 0.3µM for catechol and hydroquinone, respectively, were constructed by employing amperometric detection. Effect of possible interfering compounds was also studied, and proposed method was successfully applied for CC and HQ quantification in real samples.
authors: Institute of Nuclear Sciences "Vinča", University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia.
authors: Mladen
authors: M
authors: Lakić
authors: Institute of Nuclear Sciences "Vinča", University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia.
authors: Aleksandar
authors: A
authors: Vukadinović
authors: Institute of Chemistry - Analytical Chemistry, Karl-Franzens University Graz, A-8010 Graz, Austria.
authors: Kurt
authors: K
authors: Kalcher
authors: Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia.
authors: Aleksandar S
authors: AS
authors: Nikolić
authors: Innovation center of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia. Electronic address: dalibors@chem.bg.ac.rs.
authors: Dalibor M
authors: DM
authors: Stanković
keywords: Amperometry; Cobalt-ferrite; Electrochemistry; Modified electrode