Surface studies of the silver sulfide ion selective electrode membrane

Roland De Marco; R W Cattrall; J Liesegang; G L Nyberg; I C Hamilton

doi:10.1021/ac00220a015

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Surface studies of the silver sulfide ion selective electrode membrane

Journal article

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Surface studies of the silver sulfide ion selective electrode membrane

Roland De Marco, R W Cattrall, J Liesegang, G L Nyberg and I C Hamilton

Analytical Chemistry, Vol.62(21), pp.2339-2346

1990

DOI: https://doi.org/10.1021/ac00220a015

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Abstract

X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) have been used to examine the surface layers of the silver sulfide ion selective electrode membrane. It has been found that the outermost surface layer of the membrane is hydrated, and that equated ions do not penetrate the membrane beyond this "skin" layer. The mercuric ion undergoes ion-exchange reactions with the Ag2S surface. A study of mercuric ion interference shows that reductive Hg2+ ion exchange occurs in the presence of light, whereas a metathetic displacement reaction occurs in the dark. Ferric and cupric ion interference studies show that these ions exhibit relatively weaker effects. Exposure of Ag2S to solutions of Cl-, Br-, and I- in the presence of light has been found to cause crystals of the corresponding silver halide to grow on (and out of) the membrane surface. It is postulated that the reaction mechanism of the membrane involves photooxidation of Ag2S to produce some metal deficient sulfide(s) (e.g. Ag2S2 and/or elemental S).

Details

Title: Surface studies of the silver sulfide ion selective electrode membrane
Authors: Roland De Marco (Author) - University of Melbourne
R W Cattrall (Author) - University of Melbourne
J Liesegang (Author) - University of Melbourne
G L Nyberg (Author) - University of Melbourne
I C Hamilton (Author) - BHP Central Research Laboratories
Publication details: Analytical Chemistry, Vol.62(21), pp.2339-2346
Publisher: American Chemical Society
Date published: 1990
DOI: 10.1021/ac00220a015
ISSN: 0003-2700
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99449005102621
Output Type: Journal article

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