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Manipulation of separation selectivity for inorganic anions in capillary zone electrophoresis using control of electrolyte pH

Citation

Harakuwe, AH and Haddad, PR, Manipulation of separation selectivity for inorganic anions in capillary zone electrophoresis using control of electrolyte pH, Journal of Chromatography A, 734, (2) pp. 416-421. ISSN 0021-9673 (1996) [Refereed Article]


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DOI: doi:10.1016/0021-9673(95)01294-X

Abstract

The influence of the pH of chromate-tetradecyltrimethylammonium bromide-based electrolytes on the separation selectivity of anions using capillary zone electrophoresis was studied. Changes in migration order over the pH range 813 were marked for weak acid anions at or near their pKa due primarily to changes in effective charge. Precipitation problems encountered for electrolyte pH values less than 8 were prevented by the incorporation of small (less-than-or-equals, slant7.5% v/v) amounts of 1-butanol as additive. Using this approach the pH could be lowered to 7. Manipulation of electrolyte pH was used to increase the resolution between fluoride and phosphate, making possible the fully resolved separation of trace fluoride (1 μmg ml−1) in the presence of excess phosphate (> 800 μg ml−1). The separation of fluoride from phosphate in toothpaste is also shown.

Item Details

Item Type:Refereed Article
Keywords:pH effects; Electrolyte pH; Inorganic anions; Fluoride; Phosphate
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
Author:Harakuwe, AH (Mr Anthony Hekare Harakuwe)
Author:Haddad, PR (Professor Paul Haddad)
ID Code:8670
Year Published:1996
Web of Science® Times Cited:29
Deposited By:Chemistry
Deposited On:1996-08-01
Last Modified:2010-03-14
Downloads:0

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