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dc.contributor.authorGrygolowicz-Pawlak, Ewa
dc.contributor.authorBakker, Eric
dc.date.accessioned2017-01-30T13:40:30Z
dc.date.available2017-01-30T13:40:30Z
dc.date.created2011-06-20T20:01:39Z
dc.date.issued2010
dc.identifier.citationGrygolowicz-Pawlak, Ewa and Bakker, Eric. 2010. Background current elimination in thin layer ion-selective membrane coulometry. Electrochemistry Communications. 12 (9): pp. 1195-1198.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/33972
dc.identifier.doi10.1016/j.elecom.2010.06.017
dc.description.abstract

A promising method for the elimination of undesired capacitive currents in view of realizing a potentially calibration free coulometric ion detection system is presented. The coulometric cell is composed of a porous polypropylene tube doped with a liquid calcium-selective membrane and a silver/silver chloride wire as an inner electrode, forming a thin layer sample between wire and tubing. The total charge passed through the system during potential controlled electrolysis of the thin layer sample is indeed found to be proportional to the amount of calcium present, but non-Faradaic processes do contribute to the obtained signal. We introduce here a multi-pulse procedure that allows one to perform a second excitation pulse at the same excitation potential after exhaustive ion transfer voltammetry of calcium has taken place. The intercept of the calibration curve after background subtraction is found as 20.6 ± 0.6 μC, significantly lower than the value of 54.1 ± 0.8 μC for the uncorrected curve. Changes in sample temperature (from 23 °C to 38 °C) did equally not affect the background corrected coulometric readings, supporting that the procedure renders the readout principle more robust.

dc.publisherElsevier
dc.subjectIon-selective electrode
dc.subjectIon transfer voltammetry
dc.subjectCalibration free sensing
dc.subjectThin layer coulometry
dc.subjectPolypropylene hollow fiber membrane
dc.subjectCalcium ionophore
dc.titleBackground current elimination in thin layer ion-selective membrane coulometry
dc.typeJournal Article
dcterms.source.volume12
dcterms.source.number9
dcterms.source.startPage1195
dcterms.source.endPage1198
dcterms.source.issn13882481
dcterms.source.titleElectrochemistry Communications
curtin.departmentNanochemistry Research Institute (Research Institute)
curtin.accessStatusFulltext not available


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