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Issue 9, 2003
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Selective silver ion transfer voltammetry at the polarised liquid|liquid interface

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Abstract

Transfer of silver ions across the water|1,2-dichloroethane interface was studied by cyclic voltammetry (CV). In the absence of added neutral ionophore, Ag+ transferred across the interface when the organic phase contained either tetraphenylborate or tetrakis(4-chloro)phenylborate anions, but this transfer was not possible in the presence of organic phase hexafluorophosphate or perchlorate anions. The ion transfer processes observed were independent of the nature of the organic phase cation. The CV in the presence of tetraphenylborate exhibited a shape consistent with an ion transfer followed by chemical reaction; the rate constant for the following chemical reaction was 0.016 sāˆ’1. In the presence of tetrakis(4-chloro)phenylborate, a return peak equivalent in magnitude to the forward peak was observed, indicative of a simple ion transfer reaction uncomplicated by accompanying chemical reactions. The selectivity of the transfer was assessed with respect to other metal cations: no transfers for copper, cadmium, lead, bismuth, cobalt, nickel, palladium or zinc were observed. The selectivity of the transfer suggests this can form the basis of a selective voltammetric methodology for the determination of silver ions.

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Article information


Submitted
17 Feb 2003
Accepted
09 Jul 2003
First published
24 Jul 2003

Analyst, 2003,128, 1187-1192
Article type
Paper

Selective silver ion transfer voltammetry at the polarised liquid|liquid interface

A. Sherburn, M. Platt, D. W. M. Arrigan, N. M. Boag and R. A. W. Dryfe, Analyst, 2003, 128, 1187 DOI: 10.1039/B301832F

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