Counteracting chromatographic electrophoresis and electrochromatography

We will study here the role of two different forces that are active in a bulk flow field perpendicular to one of the forces but parallel to the other. In a fixed-bed/packed-bed column, we have seen that a solute/macrosolute is con-vected down the column with a velocity ( for 

Assume now that the direction of this electrophoretic velocity is opposite to that of and therefore that it 

Consider the case where the electrophoretic velocities of solute i in the two zones are assumed to be identical in magnitude (they have the same direction), i.e. 

It is now possible to create a situation where the magnitude of and vtz,oa j=2 are identical but their direc- 

Therefore at the interfacial region between the two regions i = and j = 2 in the colunm, species i will be focused and will concentrate. 

---