Anodic stripping voltammetry on a carbon-based ion-selective electrode. (10th September 2021)

• Record Type: Journal Article
• Authors: Park, Suji; Maier, Claudia S.; Koley, Dipankar
• Is Part Of: Electrochimica acta. Volume 390(2021)
• Publication Date: 2021-09-10
• Subjects: Ion selective electrode -- Stripping Voltammetry -- Cu2+ detection -- Ca2+ detection -- Drinking Water -- Carbon based ISEs; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138855
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this study, we demonstrated the unique capability of carbon-based ion-selective electrode (ISE) to perform highly sensitive square wave anodic stripping voltammetry, while maintaining all the properties of an ISE, 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 Ca 2+ ion-selective microelectrode (µISE) as a potentiometric method and Cu 2+ -stripping voltammetry as an amperometric method. The carbon-based ISE surface is capable of quantifying nanomolar to micromolar Cu 2+ in both a standard acetate buffer and a complex water sample. The Ca 2+ -µISE also showed a Nernstian slope of 29 mV/log [Ca 2+ ] and a detection limit of 1 µM within the linear range of 1 µM to 10 mM. It thus opens an opportunity to use the low detection limit of anodic stripping voltammetry and the high selectivity of ISE-based potentiometry.