Sensitive analyses of agricultural chemicals by capillary electrochromatography

Capillary electrochromatography using a monolithic matrix was,employed to develop a rapid and highly efficient separation methodology for the analyses of mixtures of agrochemical importance. Using this method, ppm-ppb detection limits for urea, carbamate, and phenoxy acid herbicides were achieved without a preconcentration technique. The detection limits were further decreased to low-ppb levels for the same class of compounds using an on-column preconcentration technique.