The Influence of Diffusion Fluxes on the Detection Limit of the Jalpaite Copper Ion-Selective Electrode

A Zirino; Roland De Marco; I Rivera; B Pejcic

doi:10.1002/1521-4109(200204)14:7/8<493::AID-ELAN493>3.0.CO;2-C

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The Influence of Diffusion Fluxes on the Detection Limit of the Jalpaite Copper Ion-Selective Electrode

Journal article

Peer reviewed

The Influence of Diffusion Fluxes on the Detection Limit of the Jalpaite Copper Ion-Selective Electrode

A Zirino, Roland De Marco, I Rivera and B Pejcic

Electroanalysis, Vol.14(7-8), pp.493-498

2002

DOI: https://doi.org/10.1002/1521-4109(200204)14:7/8<493::AID-ELAN493>3.0.CO;2-C

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Abstract

copper ion-selective electroder

rotating disk electroder

electrode dissolutionr

diffusion fluxr

seawater

It has been suggested that electrode dissolution and the concomitant saturation of the electrode's diffusion layer restricts the detection limit of the jalpaite Cu ion-selective electrode (ISE) to samples with total Cu levels above 10-6 mol dm-3 [1, 2]. This article will use rotating disk electrode (RDE) data for San Diego Bay seawater and Fick's law of diffusion to demonstrate that the static commercial Orion Cu ISE (employing a jalpaite membrane) produces a background level of contamination of (2.0±0.5) × 10-8 mol dm-3 total Cu, and the reduced thickness of the Orion Cu ISE's diffusion layer in the presence of hydrodynamic flow [e.g., at an RDE, or in continuous flow analysis (CFA)] lowers the background contamination of Cu to < 10-9 mol dm-3. Furthermore, the RDE Cu ISE employing an electrode fabricated using jalpaite precipitated in 80% excess Na2S, so as to minimize the presence of occluded and leachable Cu2+ salts and extraneous phases such as silver sulfide [3 - 5], reveals an improvement in the lower limit of detection compared to the commercial Orion Cu ISE.

Details

Title: The Influence of Diffusion Fluxes on the Detection Limit of the Jalpaite Copper Ion-Selective Electrode
Authors: A Zirino (Author) - SPAWAR Systems Centre, United States
Roland De Marco (Author) - Curtin University of Technology
I Rivera (Author) - SPAWAR Systems Centre, United States
B Pejcic (Author) - Curtin University of Technology
Publication details: Electroanalysis, Vol.14(7-8), pp.493-498
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
Date published: 2002
DOI: 10.1002/1521-4109(200204)14:7/8<493::AID-ELAN493>3.0.CO;2-C
ISSN: 1040-0397
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99448829902621
Output Type: Journal article

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