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A Model of Non-Nernstian Response in the Determination of Aluminum Ions by Indirect Potentiometry


Ngila, JC and Alexander, PW and Hibbert, DB, A Model of Non-Nernstian Response in the Determination of Aluminum Ions by Indirect Potentiometry, Electroanalysis, 7, (10) pp. 947-951. ISSN 1040-0397 (1995) [Refereed Article]

DOI: doi:10.1002/elan.1140071007


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

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Instrumental methods (excl. immunological and bioassay methods)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Alexander, PW (Professor Peter Alexander)
ID Code:8777
Year Published:1995
Web of Science® Times Cited:2
Deposited By:Applied Science
Deposited On:1995-08-01
Last Modified:2011-08-25

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