Response of the Iron Chalcogenide Glass Membrane Ion-Selective Electrode in a Seawater Ligand Mimetic Calibration Buffer

Roland De Marco; J Martizano

doi:10.1002/elan.200704012

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Response of the Iron Chalcogenide Glass Membrane Ion-Selective Electrode in a Seawater Ligand Mimetic Calibration Buffer

Journal article

Peer reviewed

Response of the Iron Chalcogenide Glass Membrane Ion-Selective Electrode in a Seawater Ligand Mimetic Calibration Buffer

Roland De Marco and J Martizano

Electroanalysis, Vol.19(24), pp.2513-2517

2007

DOI: https://doi.org/10.1002/elan.200704012

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Abstract

Physical Chemistry (incl. Structural)

iron ion-selective electrode

iron speciation

seawater

As a continuation of recent mechanistic studies into the influence of seawater ligands on the surface chemistry of the iron chalcogenide glass membrane ion-selective electrode (ISE), the present study has investigated the response of the iron(III) ISE in a seawater ligand mimetic system to examine its suitability as a calibration medium for the electroanalysis of raw or natural seawater. Significantly, dip method calibrations of the ISE in a mixture of salicylate, ethylene diamine tetraacetic acid (EDTA), ethylene diamine and minor amounts of dissolved iron(III) and copper(II) yielded the expected Nernstian response of 30â€…mV/decade according to the known ion-exchange/electron transfer response mechanism of this ISE. Furthermore, ideal Nernstian response of the electrode is also obtained in a continuous flow analysis (CFA) mode, noting that this provides scope for using a hydrodynamic flow regime to minimize the electrode release of iron and the concomitant detection limit of the ISE. Ultimately, repetitive CFA analyses of free iron(III) in raw or natural seawater yielded a free iron(III) level commensurate with the expected inorganic and organic speciation of iron(III) in seawater.

Details

Title: Response of the Iron Chalcogenide Glass Membrane Ion-Selective Electrode in a Seawater Ligand Mimetic Calibration Buffer
Authors: Roland De Marco (Author) - Curtin University of Technology
J Martizano (Author) - University of the Philippines, Philippines
Publication details: Electroanalysis, Vol.19(24), pp.2513-2517
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
Date published: 2007
DOI: 10.1002/elan.200704012
ISSN: 1040-0397
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99449719602621
Output Type: Journal article

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