CAPILLARY ELECTROPHORESIS OF QUATERNARY AMMONIUM ION HERBICIDES - PARAQUAT, DIQUAT AND DIFENZOQUAT

Capillary electrophoresis of the quaternary ammonium ion herbicides, p araquat, diquat and difenzoquat was studied. Electrolyte running solut ions with different alkaline salts were used to reduce adsorption of t he solutes on the capillary wall. The influence of pH, temperature, ap plied voltage, buffer cation and injection mode was investigated. The results are discussed in terms of separation parameters such as migrat ion time, apparent mobility, plate height and resolution. In addition, improvement of sensitivity related to the migration velocity and inje ction mode was observed. Resolution of paraquat and diquat was critica l and required well-established conditions.