(333l) Effect Of Dispersion Of Ions On The Performance Of An Electrophoretic Cell With Orthogonal Electrical Field

The hydrodynamic of a system, as it has been demonstrated, has an effect on the transport of solute in an electrophoretic cell. The role of an orthogonal field to flow direction on the hydrodynamic of a system has been studied by the authors using a cell of rectangular geometry*. The study has been extended to include an annular system where the role of the radial transport may be different to that in rectangular systems. Furthermore, the role of the cross sectional area size in an annular cell may have a different effect on the movement of ions of different oxidation state. The method of spatial averaging is used in combination with the solute species continuity equation to determine the effect of the disersion of the charged ions on device performance in a Poiseuille type flows, under the stress of electric fields. Explicit analytical expressions are derived for the effective parameters as a function of the applied electric field, capillary porosity and the flow regime. The result of the analysis can be used in the design of separation processes as well as environmental applications such as soil remediation and wastewater treatment.

___________________________ *Mario A. Oyanader and Pedro Arce, Role of Geometrical Dimensions in Electrophoresis Applications with Orthogonal Fields, Electrophoresis 2005, 26, 2857?2866.