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Flow-injection analysis with potentiometric detection for the speciation of fluoride and calcium


Trojanowicz, M and Alexander, PW and Hibbert, DB, Flow-injection analysis with potentiometric detection for the speciation of fluoride and calcium, Analytica Chimica Acta, 366, (1-3) pp. 23-33. ISSN 0003-2670 (1998) [Refereed Article]

DOI: doi:10.1016/S0003-2670(97)00637-5


Three flow injection systems with potentiometric detection have been developed for speciation of fluoride using a fluoride ion-selective electrode with a single flow-through detector. Among systems with (i) splitting of the sample zone and confluence point, (ii) flow reversal and (iii) resampling, the latter was most suitable. Its application was demonstrated for a study of the effectiveness of releasing fluoride from complexes with Al(III). Several ligands were examined as decomplexing agents such as EDTA, cyclohexane-1,2-diamine-N,N,N',N'tetraacetic acid (DCTA), citrate and 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt (Tiron). In flow injection measurements, only Tiron was found suitable for decomposition of Al(III)-fluoride complexes. In stopped-flow measurements, it was observed that with use of citrate or DCTA about a 10min delay was required to release fluoride from Al(III) complexes. A flow-injection system with resampling was also utilised for speciation of calcium with ion-selective electrode in ligand solutions and in natural waters. Copyright (C) 1998 Elsevier Science B.V.

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:14340
Year Published:1998
Web of Science® Times Cited:19
Deposited By:Applied Science
Deposited On:1998-08-01
Last Modified:2011-08-09

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