Journal of the Brazilian Chemical Society
versión impresa ISSN 0103-5053
ASSUNCAO, Nilson A. et al. Evaluation of a simple hyphenated system for flow injection solid-phase pre-concentration and capillary electrophoresis. J. Braz. Chem. Soc. [online]. 2008, vol.19, n.6, pp. 1165-1170. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50532008000600017.
In this work, the development and evaluation of a hyphenated flow injection-capillary electrophoresis system with on-line pre-concentration is described. Preliminary tests were performed to investigate the influence of flow rates over the analytical signals. Results revealed losses in terms of sensitivity of the FIA-CE system when compared to the conventional CE system. To overcome signal decrease and to make the system more efficient, a lower flow rate was set and an anionic resin column was added to the flow manifold in order to pre-concentrate the analyte. The pre-concentration FIA-CE system presented a sensitivity improvement of about 660% and there was only a small increase of 8% in total peak dispersion. These results have confirmed the great potential of the proposed system for many analytical tasks especially for low concentration samples.
Palabras llave : instrumentation; automation; flow injection analysis; solid-phase extraction.