Research Article
Preconcentration and Determination of Psychotropic Drugs in Urine Samples by Ion Mobility Spectrometry with Electrospray Ionization Coupling On-Line Single-Drop Liquid-Liquid-Liquid Microextraction
Figure 3
Concentration profile for NaOH (a) in the donor phase and Ac (b) in the acceptor phase.
(a) |
(b) |