title: Transient isotachophoretic-electrophoretic separations of lanthanides with indirect laser-induced fluorescence detection.
abstract: 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 La(3+), Ce(3+), Pr(3+), Nd(3+), Sm(3+), and Eu(3+) in the low-ppb range (6-11 nM).
authors.affiliation: Lawrence Berkeley National Laboratory, M/S 70-193A, Berkeley, California 94720.
authors.forename: M N
authors.initials: MN
authors.lastname: Church
authors.forename: J D
authors.initials: JD
authors.lastname: Spear
authors.forename: R E
authors.initials: RE
authors.lastname: Russo
authors.forename: G L
authors.initials: GL
authors.lastname: Klunder
authors.forename: P M
authors.initials: PM
authors.lastname: Grant
authors.forename: B D
authors.initials: BD
authors.lastname: Andresen