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Full Paper
Towards Normalising Variability in Current Responses at Glassy Carbon Electrodes Using Double Layer Capacitance; a Case Study of Citrinin
Article first published online: 10 FEB 2012
DOI: 10.1002/elan.201100645
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Issue
Electroanalysis
Special Issue: Topical Cluster: Electrochemical Sensors and Biosensors in Italy
Volume 24, Issue 4, pages 945–954, April 2012
Additional Information
How to Cite
Niland, M. J., Fogel, R., Flanagan, S. P. and Limson, J. L. (2012), Towards Normalising Variability in Current Responses at Glassy Carbon Electrodes Using Double Layer Capacitance; a Case Study of Citrinin. Electroanalysis, 24: 945–954. doi: 10.1002/elan.201100645
Publication History
- Issue published online: 30 MAR 2012
- Article first published online: 10 FEB 2012
- Manuscript Accepted: 16 JAN 2012
- Manuscript Received: 10 NOV 2011
Keywords:
- Adsorption;
- Double layer capacitance;
- Electrode surface variability;
- Glassy carbon electrode;
- Voltammetry
Abstract
Heterogeneity in surface condition is a widely reported factor of carbonaceous electrodes that leads to irreproducibility in faradaic current response(s) (Ip). As Ip and double layer capacitances (Cdl) are similarly influenced by surface associated parameters, we report on a method aimed at exploiting that interaction to normalise Ip variability of adsorptive analytes across inconsistent electrode surface preparations. A linear correlation was observed between Cdl and Ip to citrinin and 1,2,4-benzenetriol. By rendering Ip a factor of Cdl, the coefficient of variation of Ip was reduced to a third of original responses on assessed surfaces permitting determination of analyte solution concentration.