Optical fiber spectroelectrochemical device for detection of catechol at press-transferred single-walled carbon nanotubes electrodes

A new long-optical-pathway spectroelectrochemical cell for absorptometric measurements in the UV–Vis region was developed. This cell consists of two optical fibers brought face to face and fixed on the working electrode support. As a proof of concept, the spectroelectrochemical cell was applied to t...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2013-04, Vol.405 (11), p.3593-3602
Main Authors: Garoz-Ruiz, Jesus, Izquierdo, Daniel, Colina, Alvaro, Palmero, Susana, Heras, Aranzazu
Format: Article
Language:English
Subjects:
Analytical Chemistry
Analytical instruments
Biochemistry
Calibration
Carbon
Catechol
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Design and construction
Electrochemistry
Electrodes
Engineering design
Equipment and supplies
Experiments
Fiber optics
Food Science
Laboratory Medicine
Light
Mathematical analysis
Methods
Monitoring/Environmental Analysis
Nanotechnology
Optical fibers
Optical properties
Original Paper
Oxidation
Quantitative analysis
Single wall carbon nanotubes
Sorption
Ultraviolet radiation
Wavelengths
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Summary:A new long-optical-pathway spectroelectrochemical cell for absorptometric measurements in the UV–Vis region was developed. This cell consists of two optical fibers brought face to face and fixed on the working electrode support. As a proof of concept, the spectroelectrochemical cell was applied to the determination of catechol using a press-transferred single-walled carbon nanotube film as the working electrode. Voltabsorptometry was demonstrated to be very helpful in understanding the mechanism of catechol oxidation. The experiments showed that the main oxidation product is o -benzoquinone, but other soluble side products are also observed. Multivariate calibration explains the selection of 390 nm as the best wavelength for the univariate absorptometric determination of catechol, avoiding the interference of oxidation side products. Catechol was quantified using both the electrochemical and the spectroscopic signal, demonstrating that this hybrid technique is an autovalidated analytical method. Dual detection of catechol was also carried out using amperometric spectroelectrochemistry. Finally, spectroelectrochemistry was used to quantify catechol in the presence of hydroquinone.
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-013-6762-z