Electrochemical impedance spectroscopy study of the response mechanism of the jalpaite Cu(II) ion-selective electrode in seawater

Roland De Marco; R Eriksen; A Zirino

doi:10.1021/ac980196+

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Electrochemical impedance spectroscopy study of the response mechanism of the jalpaite Cu(II) ion-selective electrode in seawater

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Electrochemical impedance spectroscopy study of the response mechanism of the jalpaite Cu(II) ion-selective electrode in seawater

Roland De Marco, R Eriksen and A Zirino

Analytical Chemistry, Vol.70(22), pp.4683-4689

1998

DOI: https://doi.org/10.1021/ac980196+

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Abstract

copper ion

sea water

electrochemical analysis

impedance

ion selective electrode

potentiometry

spectrometry

This paper presents the results of a novel study into the response mechanism of the jalpaite copper(II) ion-selective electrode (ISE) using electrochemical impedance spectroscopy (EIS) under conditions of minimal overpotential stimulation (i.e., ±10 mV). The EIS spectra of the jalpaite ISE in seawater and other ionic media revealed a high-frequency surface film impedance that is attributable to the modified hydrated surface layers of the ISE, and a low-frequency charge-transfer impedance that can be ascribed to the reductive ion-exchange of Cu(II) at the membrane/electrolyte interface. EIS data for a rotating disk electrode have shown that the charge-transfer process is under diffusion control. EIS and potentiometric response data in UV-oxidized seawater spiked with humic acid imply that organic complexation of Cu(I) at the electrode diffusion layer is responsible for a weak interference effect. The classical chloride interference effect of the jalpaite Cu(II) ISE occurring at high concentrations of Cu(II) (i.e., > 10- 6 M) yields an EIS response similar to the one observed with organic ligands. An EIS experiment for a jalpaite Cu(II) ISE aged in seawater for 72 h demonstrated that the charge-transfer impedance is constant until electrode release of Cu(II) exceeds the complexing capacity of seawater, and this mechanistic information is consistent with the hypothesis that electrode dissolution can be used to autotitrate the natural ligands in seawater.

Details

Title: Electrochemical impedance spectroscopy study of the response mechanism of the jalpaite Cu(II) ion-selective electrode in seawater
Authors: Roland De Marco (Author) - Curtin University of Technology
R Eriksen (Author) - University of Tasmania
A Zirino (Author) - Naval Command, Control and Ocean Surveillance Center
Publication details: Analytical Chemistry, Vol.70(22), pp.4683-4689
Publisher: American Chemical Society
Date published: 1998
DOI: 10.1021/ac980196+
ISSN: 0003-2700; 0003-2700
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99448808902621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Analytical