Surface studies of the jalpaite-based copper(II) ion-selective electrode membrane in seawater

Roland De Marco

doi:10.1016/S0304-4203(96)00063-1

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Surface studies of the jalpaite-based copper(II) ion-selective electrode membrane in seawater

Journal article

Peer reviewed

Surface studies of the jalpaite-based copper(II) ion-selective electrode membrane in seawater

Roland De Marco

Marine Chemistry, Vol.55(3-4), pp.389-398

1996

DOI: https://doi.org/10.1016/S0304-4203(96)00063-1

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Abstract

surface analysis

copper ion selective electrode

jalpaite membrane

potentiometry

sea water

X-ray photoelectron spectroscopy

Ageing of the jalpaite Cu(II) ion selective electrode (ISE) membrane in saline solutions and seawater has been studied using X-ray photoelectron spectroscopy (XPS), and it is shown that the membrane surface composition is altered after exposure to these media, XPS evidence shows that the change in membrane surface composition in a saline Cu(II) ion buffer involves the transformation of jalpaite (i.e. Ag1.5Cu0.5S) to a mixture comprising copper-deficient sulfide (i.e. Ag1.5Cu(0.5-2x)S(1-x)) and AgCl. A similar process takes place in seawater with the exception that AgI is also formed on the membrane surface. The variation in membrane surface composition in saline solution and seawater has been linked to the electrochemical behaviour of the Cu(II) ISE. XPS analysis of membranes treated in seawater has identified the carboxylic acid based organic substances of seawater (i.e. humic and fulvic acids) on the surface of the jalpaite membrane. In seawater and saline Cu(II) ion buffers, the chloride induced poisoning of the jalpaite membrane is suppressed through the adsorption of surfactant-like ionic forms of the organic ligands onto the membrane surface. The findings of this work have important ramifications for the application of the jalpaite Cu(II) ISE in studies of Cu(II) complexation in seawater.

Details

Title: Surface studies of the jalpaite-based copper(II) ion-selective electrode membrane in seawater
Authors: Roland De Marco (Author) - Curtin University of Technology
Publication details: Marine Chemistry, Vol.55(3-4), pp.389-398
Publisher: Elsevier BV
Date published: 1996
DOI: 10.1016/S0304-4203(96)00063-1
ISSN: 0304-4203
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99448798802621
Output Type: Journal article

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