A mathematical model was set up for the calculation of all parameters in sample zones in capillary zone electrophoresis. In this model, sample peaks are divided into small segments with varying sample component concentrations and all parameters of a segment can be calculated from the parameters of the preceding segment with a steady-state model, based on the mass balances of the co- and counter ions, the electroneutrality equation and the modified Ohm's law. In this way, non-steady-state electrophoretic processes can be estimated by a repeated application of a steady-state model. Although in this model only the electrodispersive effect is considered and other peak broadening effects, such as diffusion, are neglected, this model is very usef...