SPECIATION OF ALUMINUM USING CAPILLARY ZONE ELECTROPHORESIS WITH INDIRECT UV DETECTION

Citation
N. Wu et al., SPECIATION OF ALUMINUM USING CAPILLARY ZONE ELECTROPHORESIS WITH INDIRECT UV DETECTION, Journal of chromatography, 635(2), 1993, pp. 307-312
Citations number
19
Journal title
Volume
635
Issue
2
Year of publication
1993
Pages
307 - 312
Database
ISI
SICI code
Abstract
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.