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dc.contributor.authorChumbimuni-Torres, K.
dc.contributor.authorCalvo-Marzal, P.
dc.contributor.authorWang, J.
dc.contributor.authorBakker, Eric
dc.date.accessioned2017-01-30T15:13:03Z
dc.date.available2017-01-30T15:13:03Z
dc.date.created2008-11-12T23:36:25Z
dc.date.issued2008
dc.identifier.citationChumbimuni-Torres, Karin Y. and Calvo-Marzal, Percy and Wang, Joseph and Bakker, Eric. 2008. Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes. Analytical Chemistry 80: 6114-6118.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/44252
dc.identifier.doi10.1021/ac800595p
dc.description.abstract

Potentiometric sensors are today sufficiently well understood and optimized to reach ultratrace level (subnanomolar) detection limits for numerous ions. In many cases of practical relevance, however, a high electrolyte background hampers the attainable detection limits. A particularly difficult sample matrix for potentiometric detection is seawater, where the high saline concentration forms a major interfering background and reduces the activity of most trace metals by complexation. This paper describes for the first time a hyphenated system for the online electrochemically modulated preconcentration and matrix elimination of trace metals, combined with a downstream potentiometric detection with solid contact polymeric membrane ion-selective microelectrodes. Following the preconcentration at the bismuth-coated electrode, the deposited metals are oxidized and released to a medium favorable to potentiometric detection, in this case calcium nitrate. Matrix interferences arising from the saline sample medium are thus circumvented. This concept is successfully evaluated with cadmium as a model trace element and offers potentiometric detection down to low parts per billion levels in samples containing 0.5 M NaCl background electrolyte.

dc.publisherAmerican Chemical Society
dc.relation.urihttp://pubs.acs.org/journals/amcham/index.html
dc.titleElectrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes
dc.typeJournal Article
dcterms.source.volume80
dcterms.source.monthaug
dcterms.source.startPage6114
dcterms.source.endPage6118
dcterms.source.titleAnalytical Chemistry
curtin.note

Open access to this article will be available 12 months after publication via the website of the American Chemical Society. http://acswebcontent.acs.org/home.html

curtin.note

The website for Analytical Chemistry is available at:

curtin.departmentNanochemistry Research Institute (Research Institute)
curtin.identifierEPR-3025
curtin.accessStatusFulltext not available
curtin.facultyNanochemistry Research Centre


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