Sensitive and quantitative group-type analysis (alkanes-naphthenes-aromatics-polars) of a wide range of petroleum products using berberine-induced fluorescence densitometry in thin-layer chromatographic systems.

1. Cebolla, VL
2. Membrado, L
3. Domingo, MP
4. Garriga, R
5. Galvez, EM
6. Cossio, FP
7. Arrieta, A