| Part I of this thesis involves the evaluation of 8-hydroxyquinoline immobilized on a macroporous resin (XAD-oxine) for the determination of free magnesium using a previously described semi-automated column equilibration-atomic absorption spectrophotometry technique. Essentially the technique involves equilibration of a magnesium containing solution with the resin, and then eluting the sorbed magnesium directly into the atomic absorption spectrometer.;Two column equilibration procedures were characterized. The with washing procedure has 4 steps in a measurement cycle i.e. column equilibration, water wash, elution and another water wash. The other, without washing, procedure has two steps i.e. column equilibration and elution. The effect of pH, ionic strength, and other cations on the sorption behavior of Mg;In Part II of this thesis, the behavior of solute adsorbed at the liquid-liquid interface during solvent extraction with porous membrane phase separators was investigated. It is shown experimentally for the interfacially adsorbed component, methylene blue perchlorate, that the distribution isotherm between chloroform and water is the same in stirred and unstirred mixtures. This suggests that the interfacially adsorbed solute remains at the interface and does not enter the bulk liquid phases during membrane induced coalescence and phase separation. Theoretical calculations also show that adsorbed solute does not enter the bulk liquid at the surface of the membrane during phase separation. |
