QUANTITATIVE ASPECTS OF RARE-EARTH-METAL DETERMINATIONS USING CAPILLARY ELECTROPHORESIS WITH INDIRECT ABSORBENCY DETECTION

The practical utility of capillary zone electrophoresis with indirect absorbance detection is examined for the separation and quantitation o f rare earth metals. Various imidazole derivatives are investigated as to their suitability as running buffer (displaceable) detection ions with alpha-hydroxyisobutyric acid functioning as a chelating agent to enhance separations. Parameters important for quantitative analysis, s uch as limits of detection, relative standard deviation of peak areas, efficiency, resolution, peak shape and linear dynamic range are prese nted. The influences of sample matrix, method of injection, and backgr ound ion identity on these parameters are investigated and discussed.