Separation and indirect detection by capillary zone electrophoresis of ppb (w/w) levels of aluminum ions in solutions of multiple cations

摘要: Abstract Solutions of multiple cations in aqueous solutions at concentrations as low 200 ppb were analyzed by capillary zone electrophoresis. Aluminum ions cleanly separated from Li + , K Ca 2+ Cr 3+ Zn CU and other less than 6 min after injection the solution on a 50 cm × μm I.D. uncoated fused-silica column 15 kV. Indirect detection 204 nm was carried out using pH 2.8 background electrolyte containing 5.2 m M ephedrine UV-absorbing co-ion 4.7 α-hydroxyisobutyric acid completing counter ion. Mobilities for Al 14 complexed determined this electrolyte.