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Until no w, fluorescein sodium salt has been used to gener ate the background signal for indirect fluorimetric detection of inorganic cations or mono-charged organic anions separated by Capillary Zone Electrophoresis (CZE). In this paper , we extend the use of fluorescein sodium salt to the simultaneous CZE analysis of inor ganic anions (Cl - , NO - 2 , NO - 3, SO 2- 4 , F - ) and poly- charged or ganic anions (oxalate and citr ate). The electroosmoti c flow was reversed by using tetradecyltrimethylammonium bro- mide (TTAB) or hexadimethrin e. The specific problems linked to the simultaneous utilization of fluorescein sodium salt and a positively char ged capillary were studied and resolved by reducing the fluorescein/TTAB interactions and by optimizing the fluo - rophore concentration in the electrolyte . The study of r eproducibility and the quantitati ve approach led to very good results. In such conditions the quantification of Cl - , NO - 3 and SO 2- 4 , in dif ferent mineral and spring waters, has been successfully realized . In addition, the detection thresholds reached the range of one hundred to a f ew hundred ppb. Key wo rd s . C ap i l l a r y zone electro p h o resis - indirect fl u o ri m e t r ic detection - fl u o rescein sodium salt - inorganic anions - polycharged or ganic anions.

analusis

Optimization of the indirect fluorimetric detection for the simultaneous analysis of inorganic anions and polycharged organic anions by capillary electrophoresis