Amphetamine and methamphetamine determination in urine by reversed-phase high-performance liquid chromatography with simultaneous sample clean-up and derivatization with 1,2-naphthoquinone 4-sulphonate on solid-phase cartridges

1. Campíns-Falcó, P.
2. Sevillano-Cabeza, A.
3. Molíns-Legua, C.
4. Kohlmann, M.