Journal article
Electrochemical sample matrix elimination for trace-level potentiometric detection with polymeric membrane ion-selective electrodes
Analytical Chemistry, Vol.80(15), pp.6114-6118
2008
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.
Details
- Title
- Electrochemical sample matrix elimination for trace-level potentiometric detection with polymeric membrane ion-selective electrodes
- Authors
- K Y Chumbimuni-Torres (Author) - Purdue University, United StatesP Calvo-Marzal (Author) - Purdue University, ThailandJ Wang (Author) - Arizona State University, United StatesEric Bakker (Author) - Curtin University of Technology
- Publication details
- Analytical Chemistry, Vol.80(15), pp.6114-6118
- Publisher
- American Chemical Society
- Date published
- 2008
- DOI
- 10.1021/ac800595p
- ISSN
- 0003-2700; 0003-2700
- Copyright note
- Copyright © 2008 American Chemical Society. The author's accepted version is reproduced here in accordance with the publisher's copyright policy.
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450022202621
- Output Type
- Journal article
- Research Statement
- false
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- Collaboration types
- Domestic collaboration
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- Web Of Science research areas
- Chemistry, Analytical