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Scaling of Electrode-Electrolyte Interface Model Parameters In Phosphate Buffered Saline

Abstract
We report how the impedance presented by a platinum electrode scales with the concentration of phosphate buffered saline (PBS). We find that the constant phase element of the model scales with approximately the log of concentration, whereas the resistivity is inversely proportional. Using a novel DC measurement technique we show that the Faradaic response of a platinum electrode, and thus the safe exposure limit, does not scale with concentration below 900mV overpotential across a pair of electrodes. We compare objective measurements made in saline to those made in the spinal cavity of live sheep. We comment upon the appropriateness of using PBS as a substitute for living sheep.
Type
Journal Article
Type of thesis
Series
Citation
Jones, M. H., & Scott, J. B. (2014). Scaling of Electrode-Electrolyte Interface Model Parameters In Phosphate Buffered Saline. IEEE Transactions on Biomedical Circuits and Systems, 9(3), 441–448. http://doi.org/10.1109/TBCAS.2014.2333759
Date
2014
Publisher
IEEE
Degree
Supervisors
Rights
This is the author's accepted version of an article published in Transactions on Biomedical Circuits and Systems. © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.