SIMULTANEOUS SEPARATION OF NEUTRAL AND ACIDIC HERBICIDES BY MICELLAR ELECTROKINETIC CAPILLARY CHROMATOGRAPHY

Micellar electrokinetic capillary chromatography (MECC) is used for the simultaneous separation of mixtures of phenylurea and phenoxyalkyl acid herbicides. The influence of buffer and micellar concentration on the separation of the herbicides has been studied and the obtained results are compared with those obtained by using capillary zone electrophoresis (CZE). By using the MECC system, the total separation of a mixture of nine different herbicides in 16 minutes has been achieved. In addition, from the experimental results, the distribution coefficient (K) of each herbicide between micellar and aqueous phases, and the critical micelle concentration (CMC) under the experimental conditions, have been calculated.