Analysis of arylamine isomers by micellar electrokinetic chromatography

Determination of aromatic amines in water samples by capillary electrophoresis with amperometric detection

Aromatic amines such as aniline and its derivatives are an important class of environmental water pollutants. A method based on capillary zone electrophoresis with amperometric detection (CZE-AD) at carbon disk electrode was developed for the determination of aromatic amines in water samples. The effects of working potential, pH and concentration of running buffer, separation voltage and injection time were investigated. Under the optimum conditions, 2,3-diaminonaphthalene, aniline, o-phenylenediamine and p-chloroaniline could be separated in 0.16 mol/L Na(2)HPO(4)-citric acid buffer (pH 4.6) within 23 min. The detection limits of them were 1.0 x 10(-7), 3.3 x 10(-8), 5.0 x 10(-8), and 1.3 x 10(-7)mol/L (S/N=3), respectively. The method can be applied directly for the determination of aromatic amines in real water samples with satisfactory results.

MEKC: An update focusing on practical aspects

This paper reviews recent methodological and instrumental advances in MEKC. Improvements in sensitivity arising from the use of on-line sample concentration (sweeping, stacking, and combination of both protocols) and derivatization (in-capillary reactions and coupling with flow-injection systems) and improvements in resolution obtained by changing the composition of the BGE (e.g., with organic modifiers, ionic liquids, nonionic and zwitterionic surfactants, mixed micelles, and vesicles) or using coated capillaries are discussed in detail. In addition, MS and LIF spectroscopy are examined in relation to their advantages and restrictions as applied to MEKC analysis. Some thoughts on potential future directions are also expressed.