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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 8–13 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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