Microfabricated three-electrode on-chip PDMS device with a vibration motor for stripping voltammetric detection of heavy metal ions
A microfabricated three-electrode on-chip device with a vibration motor for stripping voltammetric detection of Cd2+ and Pb2+ ions is introduced. Gold electrodes on a glass substrate are utilized as the counter electrode directly, as well as the working electrode with bismuth coating. The reference...
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Veröffentlicht in: | Talanta (Oxford) 2015-01, Vol.132, p.321-326 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A microfabricated three-electrode on-chip device with a vibration motor for stripping voltammetric detection of Cd2+ and Pb2+ ions is introduced. Gold electrodes on a glass substrate are utilized as the counter electrode directly, as well as the working electrode with bismuth coating. The reference electrode is achieved by painting silver/silver chloride layer on the gold layer. Polydimethylsiloxane (PDMS) cover is bonded onto the glass substrate, organizing a compact module. A vibration motor in the device provides vibration as the alternate for stirring to improve detection limits and decrease deposition time. Cyclic voltammetry (CV) is performed with the on-chip reference electrode and a commercial liquid electrolyte Ag/AgCl electrode, showing that the potential shift is less than 20mV. Differential pulse stripping voltammetry (DPSV) is used to detect Cd2+ and Pb2+ ions. Linearity is well defined from 10µg/L to 80µg/L for both ions. Detection limits for Cd2+ and Pb2+ ions are 0.7µg/L and 1.2µg/L, respectively, at 325s deposition without vibration; the limits are 0.11µg/L and 0.25µg/L at 120s deposition with vibration. The reliability is verified by detecting Cd2+ and Pb2+ concentrations of natural water samples and comparing with the results obtained from inductively coupled plasma mass spectrometry (ICP-MS).
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•A microfabricated three-electrode device with a motor for heavy metal detection.•Integration of three electrodes contributes to simplification of the instrumentation.•Vibration helps to achieve quick detection and improve the detection limits.•Detection limits for Cd2+ and Pb2+ ions reach 0.11 and 0.25µg/L. |
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ISSN: | 0039-9140 1873-3573 |
DOI: | 10.1016/j.talanta.2014.08.075 |