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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, DB
Flow 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

History

Publication title

Electroanalysis

Volume

7

Issue

10

Pagination

947-951

ISSN

1040-0397

Department/School

University College

Publisher

Wiley-V C H Verlag Gmbh

Place of publication

Weinheim, Germany

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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