Anion selective exhaustive injection-sweep-micellar electrokinetic chromatography

A selective on-line sample concentration technique of anion selective exhau stive injection (ASEI)-sweep-micellar electrokinetic chromatography (MEKC) was evaluated using a cationic surfactant. To suppress the electroosmotic f low, a polyacrylamide-coated capillary was introduced. Some aromatic carbox ylic acids, dansyl amino acids, and naphthalene-disulfonic acids were used as test analytes. About 1000- to 6000-fold increases in detection sensitivi ty were obtained in terms of peak heights by ASEI-sweep-MEKC. (C) 2001 Else vier Science B.V. All rights reserved.