Hong Cao

Date of Award


Degree Name

Master of Science



First Advisor

Dr. Subra Muralidharan

Second Advisor

Dr. Donald R. Schreiber

Third Advisor

Dr. Brian P. Buffin

Access Setting

Masters Thesis-Open Access


We have investigated the separation of Co(II), Ni(II), Cu(II) and Zn(II) by the ligands 8-hydroxyquinoline- 5-sulfonic acid and 7-iodo-8-hydroxy-quinoline- 5-sulfonic acid in the presence of the anionic surfactant sodium dodecyl sulfate (SDS) and the cationic surfactant octyltrimethylammonium bromide (OTAB) . Baseline separations have been achieved by HPLC employing an octadecylsilanized silica (ODS) column. The underlying mechanisms of separation have been determined.

The significant new results of our studies are: (1) separation is not possible without the presence of surfactants and hence organized assemblies; (2) separations can be achieved under submicellar concentrations; (3) the separations are not driven by micelles; and (4) several competing equilibria must be taken into account to understand the mechanism of separation.

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Chemistry Commons