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Abstract

The suitability of high performance chelation ion chromatography (HPCIC) using postcolumn reaction for the separation and determination of dissolved aluminium in complex samples was investigated. Use of a chelating ion-exchanger allowed for differentiation between kinetically labile and kinetically stable species of aluminium. Separation through a combination of chelation and cation-exchange was achieved using a 200×4.0 mm id column packed with particles of silica functionalised with iminodiacetic acid, with nitric acid-potassium chloride eluents. A temperature anomaly causing a five-fold increase in column efficiency for aluminium is believed to be a result of localised temperature effects in the particular type of instrument used. Postcolumn reagents investigated for the photometric detection included Tiron, Pyrocatechol Violet, Chrome Azurol S, and Eriochrome® Cyanine R. The lowest detection limit (2.7 {micro}g/L for a 100 {micro}L sample volume) was achieved using 0.25 mM Eriochrome Cyanine R in 0.2 M hexamine (pH 6.1) with 1 mM cetyltrimethylpyridium bromide (CTAB). The optimised HPCIC system was applied successfully to the quantification of labile aluminium in paper mill process water.

Item Type:	Article
Authors/Creators:	Tria, J and Haddad, PR and Nesterenko, PN
Keywords:	Aluminium • High performance chelation ion chromatography • Postcolumn reaction
Journal or Publication Title:	Journal of Separation Science
ISSN:	1615-9306
DOI / ID Number:	10.1002/jssc.200800046
Additional Information:	The original publication is available at http://www.interscience.wiley.com/
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