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A Model of Non-Nernstian Response in the Determination of Aluminum Ions by Indirect Potentiometry
journal contribution
posted on 2023-05-16, 10:21 authored by Ngila, JC, Alexander, PW, Hibbert, DBFlow analysis data of the response of an aluminum wire electrode to fluoride into which Al3+ is added is modeled assuming a logarithmic response of the electrode to F− and reaction of F− with aluminum ions to give a series of complexes [AlFq](3−q)+ when q = 1,2,3,4,5,6. The solutions were maintained at pH 5.0 with acetic acid/acetate buffer. Other species modeled were the hydroxo complexes of aluminum [Alm(OH)n](3m−n)+ when m = 1, n = 1,2,3,4; m = 2, n = 2; m = 3, n = 4; m = 13, n = 32, and the acetate complex [Al2(OH)2OAc]3+. Protonation of F− to HF and HF 2− was also considered. Three coefficients were required to fit the data, a constant and slope of the response of the electrode to free fluoride and a dispersion factor in the flow analysis. Published stability constants were used and no account was taken of ionic strength. The model may be used to predict optimum analysis conditions given an approximate aluminum concentration. Copyright © 1995 VCH Verlagsgesellschaft mbH
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Publication title
ElectroanalysisVolume
7Issue
10Pagination
947-951ISSN
1040-0397Department/School
University CollegePublisher
Wiley-V C H Verlag GmbhPlace of publication
Weinheim, GermanyRepository Status
- Restricted
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