Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes
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 samp...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Published: |
American Chemical Society
2008
|
| Online Access: | http://pubs.acs.org/journals/amcham/index.html http://hdl.handle.net/20.500.11937/44252 |
| _version_ | 1848756945863835648 |
|---|---|
| author | Chumbimuni-Torres, K. Calvo-Marzal, P. Wang, J. Bakker, Eric |
| author_facet | Chumbimuni-Torres, K. Calvo-Marzal, P. Wang, J. Bakker, Eric |
| author_sort | Chumbimuni-Torres, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:20:16Z |
| format | Journal Article |
| id | curtin-20.500.11937-44252 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:20:16Z |
| publishDate | 2008 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-442522018-03-29T09:06:49Z Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes Chumbimuni-Torres, K. Calvo-Marzal, P. Wang, J. Bakker, Eric 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. 2008 Journal Article http://hdl.handle.net/20.500.11937/44252 10.1021/ac800595p http://pubs.acs.org/journals/amcham/index.html American Chemical Society restricted |
| spellingShingle | Chumbimuni-Torres, K. Calvo-Marzal, P. Wang, J. Bakker, Eric Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes |
| title | Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes |
| title_full | Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes |
| title_fullStr | Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes |
| title_full_unstemmed | Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes |
| title_short | Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes |
| title_sort | electrochemical sample matrix elimination for trace-level potentiometric detection with polymeric membrane ion-selective electrodes |
| url | http://pubs.acs.org/journals/amcham/index.html http://hdl.handle.net/20.500.11937/44252 |