Separation and indirect detection by capillary zone electrophoresis of ppb (w/w) levels of aluminum ions in solutions of multiple cations |
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Authors: | William R Barger Robert L Mowery Jeffrey R Wyatt |
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Institution: | Chemistry Division, Naval Research Laboratory, Code 6170, 4555 Overlook Avenue SW, Washington, DC 20375, USA |
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Abstract: | Solutions of multiple cations in aqueous solutions at concentrations as low as 200 ppb were analyzed by capillary zone electrophoresis. Aluminum ions were cleanly separated from Li+, K+, Ca2+, Cr3+, Zn2+, CU2+, and other ions less than 6 min after injection of the solution on a 50 cm × 50 μm I.D. uncoated fused-silica capillary column at 15 kV. Indirect detection at 204 nm was carried out using a pH 2.8 background electrolyte containing 5.2 mM ephedrine as a UV-absorbing co-ion and 4.7 mM -hydroxyisobutyric acid as a completing counter ion. Mobilities for Al3+ and 14 other complexed cations were determined for this electrolyte. |
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