1. D. Barceló, Trends Anal. Chem.10, 323 (1991).
2. UNEP/FAO/WHO/IAEA, Assessment of the state of pollution of the Mediterranean sea by organophosphorus compounds. MAP technical reports series No 58, UNEP, Athens (1991).
3. EPA, Test methods for evaluating solid waste. Method 8140 U.S. Environmental Protection Agency, Washington DC Physical/Chemical Methods, SW-864, 1B (1986b).
4. EPA, Test methods for evaluating solid waste. Method 8120 U.S. Environmental Protection Agency, Washington DC Physical/Chemical Methods, SW-864, 1B (1986b).
5. F. Hernández, J. Beltrán, J. V. Sancho, Science Total Environ.132, 297 (1993).