Electroosmotic flow arises because

Question

Quizplus · Accepted Answer

Electroosmotic flow arises because positive ions in the mobile phase collect near the capillary surface and are drawn toward the cathode. This creates a net flow of liquid in the opposite direction of the electroosmotic drag, resulting in the movement of the analyte toward the detector. The use of buffers with charged species may enhance this effect, but the primary mechanism is the movement of positive ions in the mobile phase. Neutral species being pumped through the capillary and the apparent mobility direction do not directly cause electroosmotic flow.

Electroosmotic Flow Arises Because