This report details the comparison of AOT-decane oil-in-water and water-in-
oil microemulsions as media for capillary electrophoresis. The microemulsio
n composition was varied to produce clear, conductive solutions. Clear micr
oemulsions were obtained for 20% water-in-oil microemulsions and 10% oil-in
-water microemulsions. The behavior of the microemulsions under conditions
of the capillary electrophoresis experiment showed that the charge carrier
Tetraethylammonium salt (TEA(-)) was needed to sustain a stable current. It
was found that the migration of species in both water-in-oil and oil-in-wa
ter microemulsions is based on association with the TEA(+).
Several factors that could affect the migration of solutes in these media w
ere studied. These include the composition of the microemulsion, the applie
d voltage, the temperature, and the pH of the aqueous phase.