Graduate Thesis Or Dissertation
 

Alternating Between Amperometric Copper Detection and Potentiometric Calcium Detection on a Carbon-based Ion-selective Electrode

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/xw42ng619

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  • The unique capability of carbon-based ion-selective electrode (ISE) to perform highly sensitive anodic stripping voltammetry, while maintaining all the properties of an ISE, is demonstrated in terms of sensitivity, detection limit, response time and selectivity. Square wave anodic stripping voltammetry involves deposition and dissolution steps of metal ions, which means adsorption and desorption of metal ions on the conductive ion-selective membrane without losing its ion-sensing property. To demonstrate this capability, we chose a Ca2+ ion-selective microelectrode (µISE) as a potentiometric method and Cu2+-stripping voltammetry as an amperometric method. The carbon-based ISE surface is capable of quantifying nanomolar to micromolar Cu2+ in both a standard acetate buffer and a complex water sample. The Ca2+-µISE also showed a Nernstian slope of 29 mV / log [Ca2+] and a detection limit of 1 µM within the linear range of 1 µM to 10 mM. Thus, the carbon-based µISE uniquely allows combining the low detection limit of anodic stripping voltammetry with the high selectivity of ISE-based potentiometry.
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  • Intellectual Property (patent, etc.)
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  • 2021-12-10 to 2024-01-11

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