Abstract
It was found that the sample injection time of ions during hydrodynamic injection affects the migration time in capillary zone electrophoresis (CZE). The relationship between sample injection time and migration time is different depending on the conditions, i.e., in stacking and non-stacking runs, because the dominant factors that determine the relationship are different. In non-stacking runs, theoretically, a simple relationship is obtained, i.e., the migration time decreases linearly with increasing injection time, which is identical with experimental results for different ions. For stacking runs, a new mathematical model is developed to account for the increase in migration time with increasing sample injection time. The predictions of the model agree well with experimentally determined profiles for different ions.
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