Evaluation of a simple hyphenated system for flow injection solid-phase pre-concentration and capillary electrophoresis

Journal of the Brazilian Chemical Society

Nilson A. Assunção²  Carlos E. S. Miranda²  Fernando M. Lanças²  Maria Fernanda G. G. Rosias¹  Emanuel Carrilho² 

[1] ,Universidade de São Paulo Instituto de Química de São Carlos São Carlos SP ,Brazil

关键词: instrumentation;    automation;    flow injection analysis;    solid-phase extraction;   

DOI  :  10.1590/S0103-50532008000600017

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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