An analytical method was developed to determine simultaneously, the inorganic anion CrO2#x2212;4, and organic aromatic compounds including benzoate, 2-Cl-benzoate, phenol, m-cresol and o-/p-cresol by capillary electrophoresis (CE). Chromate and the aromatics were separated in a relatively short time with the use of a tetradecyltrimethylammonium bromide (TTAB) modified buffer solution. The detection limits of all the analytes were in the sub mg/L level with the consumption of a very small volume of sample ( 0.06 #x3BC;L). Calibration curves with high regression coefficient (r2) values (0.999#x2013;1.000) were obtained within two orders of magnitude of concentrations. Factors affecting the separation and the determination of chromate and the organic aromatics, such as the buffer electrolyte concentration, the voltage applied and the TTAB concentration, were investigated. The effect of TTAB on the direction and the magnitude of the electroosmotic flow (EOF) was also discussed. A study of the microbial catalyzed chromate reduction coupled with benzoate oxidation demonstrated the application potential of the proposed method.
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