Journal article
Thin layer coulometry ion sensing protocol with potassium-selective membrane electrodes
Electrochimica Acta, Vol.56(28), pp.10359-10363
2011
Abstract
We recently presented a calcium-selective thin-layer coulometric system in view of realizing recalibration free ion sensors. A multi-pulse protocol allowing for a significant background current correction was further modified here by a numerical evaluation of the electrolysis end-point. A potassium-selective system was studied here within the 10 μM to 1 mM KCl concentration range with a 10 mM LiCl as a background solution. A residual 20 nA s−1 signal change was used to indicate the end of exhaustive ion transfer from the sample across the ion-selective membrane. Optimized electrolysis times were found from 13.4 s for a 10 μM sample to 270 s for a 1 mM sample. The intercept of the calibration curve of observed ion transfer charge vs. concentration was found to be just 2.3 ± 2.0 μC. The observed slope of 1.18 ± 0.02 C M−1 was very similar to the one calculated based on the known volume of the sample, 1.19 ± 0.12 C M−1, suggesting that the method is promising as an absolute measurement tool.
Details
- Title
- Thin layer coulometry ion sensing protocol with potassium-selective membrane electrodes
- Authors
- E Grygolowicz-Pawlak (Author) - University of GenevaEric Bakker (Author) - University of Geneva
- Publication details
- Electrochimica Acta, Vol.56(28), pp.10359-10363
- Publisher
- Pergamon
- Date published
- 2011
- DOI
- 10.1016/j.electacta.2011.02.053
- ISSN
- 0013-4686
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99449411902621
- Output Type
- Journal article
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- Web Of Science research areas
- Electrochemistry