Electroosmotic pumping is frequently used in many biomedical applications to transport liquid through microchannels. The amount of transported liquid in microchannels is a required parameter in order to design and control microdevices for such applications. The electroosmotic velocity in a microchannel can be evaluated by monitoring the overall change of the current in a capillary tube during a displacing process.

In the present work, the current-time relationship using this current-monitoring technique was used to evaluate the electroosmotic velocity of KCl, LaCl₃, TAE and TBE solutions. The experimentally evaluated velocities were compared with numerical simulations and with a direct measurement technique.

For the cases studied in this work, the current monitoring technique demonstrated good accuracy and reliability, which makes it a viable option to evaluate electroosmotic velocities for commercial biomedical applications.