Indirect laser-induced fluorescence was used for the detection of several lanthanide species separated by capillary electrophoresis. Quinine sulfate was the fluorescent component of the background electrolyte, and α-hydroxyisobutyric acid was added as a complexing agent to enable the separation of analyte ions that have similar mobilities. The UV lines (333−364 nm) of an argon ion laser were used as the excitation source with a diode array detector for monitoring the fluorescent emission at 442 nm. Electrokinetic injections and transient isotachophoresis were implemented to stack the analyte ions into more concentrated zones. On-line preconcentration factors were determined to be 700 and resulted in limits of detection for La3+, Ce3+, Pr3+, Nd3+, Sm3+, and Eu3+ in the low-ppb range (6−11 nM).
BT - Analytical Chemistry C2 - LBNL-41769 DA - 07/1998 DO - 10.1021/ac971043+ IS - 13 LA - eng LB - Laser N1 -LBNL-41769 NOT IN FILE
N2 -Indirect laser-induced fluorescence was used for the detection of several lanthanide species separated by capillary electrophoresis. Quinine sulfate was the fluorescent component of the background electrolyte, and α-hydroxyisobutyric acid was added as a complexing agent to enable the separation of analyte ions that have similar mobilities. The UV lines (333−364 nm) of an argon ion laser were used as the excitation source with a diode array detector for monitoring the fluorescent emission at 442 nm. Electrokinetic injections and transient isotachophoresis were implemented to stack the analyte ions into more concentrated zones. On-line preconcentration factors were determined to be 700 and resulted in limits of detection for La3+, Ce3+, Pr3+, Nd3+, Sm3+, and Eu3+ in the low-ppb range (6−11 nM).
PY - 1998 SP - 2475 EP - 2480 ST - Anal. Chem. T2 - Analytical Chemistry TI - Transient Isotachophoretic−Electrophoretic Separations of Lanthanides with Indirect Laser-Induced Fluorescence Detection VL - 70 ER -