Determination of alkali and alkaline earth metals in real samples by capillary ion analysis

Imidazole-H 2SO 4 background electrolyte was used to perform capillary ion analysis with indirect UV detection. Baseline separation of K, Na, Ca, Mg and Mn was achieved and the resolution could be enhanced by decreasing the pH of the electrolyte buffer. The electromigration dispersion for Na was sma...

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Bibliographic Details
Published in:Journal of Chromatography A 1994-07, Vol.673 (2), p.275-285
Main Authors: Yang, Qing, Jimidar, M., Hamoir, T.P., Smeyers-Verbeke, J., Massart, D.L.
Format: Article
Language:English
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Summary:Imidazole-H 2SO 4 background electrolyte was used to perform capillary ion analysis with indirect UV detection. Baseline separation of K, Na, Ca, Mg and Mn was achieved and the resolution could be enhanced by decreasing the pH of the electrolyte buffer. The electromigration dispersion for Na was smaller in the imidazole-H 2SO 4 buffer than in the background electrolyte containing UVCatl (a UV-absorbing amine) and 2-hydroxyisobutyric acid. This therefore resulted in less Na peak broadening. As a consequence, large amounts of Na could be separated efficiently without interference with the other analyte cations. The method was validated for the quantitative analysis of pharmaceutical electrolyte solutions and beverages, and compared with flame atomic spectrometry for evaluation.
ISSN:0021-9673
DOI:10.1016/0021-9673(94)85044-5