N. Wu et al., SPECIATION OF ALUMINUM USING CAPILLARY ZONE ELECTROPHORESIS WITH INDIRECT UV DETECTION, Journal of chromatography, 635(2), 1993, pp. 307-312
Capillary zone electrophoresis was evaluated as a method for the speci
ation of aluminum in aqueous solution using indirect UV absorption det
ection. Fluoro- and oxalatoaluminum complexes appeared as sharp and we
ll-defined peaks within the electropherogram of aluminum standard solu
tions when the appropriate ligand was added. Simultaneous separation o
f these inorganic and organic aluminum species was achieved with good
resolution in a single analytical run within 5 min. Indirect UV detect
ion was achieved at 214 nm with a background electrolyte buffer contai
ning 5 mM imidazole. The average limit of detection was about 10 nM fo
r uncomplexed and complexed aluminum species. Excellent agreement betw
een experimental and theoretical species concentrations (via the therm
odynamic speciation model SOILCHEM) was obtained for solutions with va
rying ligand/aluminum mol ratios and pH values.