By Lubomir Simeonov, Elisabeta Chirila

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Extra info for Chemicals as Intentional and Accidental Global Environmental Threats (NATO Science for Peace and Security Series C: Environmental Security)

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Lessons can be learned from the knowledge gained from investigation, study or other activities in regard to the technical, behavioral, cultural, management, or other factors that led, could have led, or contributed to the occurrence of an accident. In order to translate lessons learned into effective practice, attention should be also paid to their effective dissemination. Sharing of information, dissemination of lessons learned and implemented; networking among governmental authorities and experts as well as the harmonization of instruments, such as enforcement measures and educational activities, represents important factors to improve strategies in this field (OECD, 2005).

For organic pollutants extraction, a 5-10 g amount of fish and mussel liver was homogenized with anhydrous sodium sulfate and extracted with n-hexane in a Soxhlet device. , 2004b). Liquid-solid extraction Rotary evaporator PAHs Activated Al2O3+SiO2 Pesticides Activated Fluorisil Elution n-hexane:dichloromethane (3:1) Concentration Kuderna-Danish + 9,10 dihydroantracene GC-MS FIGURE 5. Biota samples preparation. + trichlorobiphenyl GC-ECD 27 Then the obtained extracts were prepared for PAHs and OCPs determination as above.

All the lyphophyle pollutants are extracted from the aqueous into the organic phase. During the process the aqueous phase remains on the stationary phase and emulsion formation is no longer possible. The extract can be vaporized and the pollutants will be analyzed. Solid-phase extraction. This technique replaces the classic liquid-liquid extraction and is based on the observation that the organic analytes can be adsorbed on a specific substrate, in a micro column. On this route, the interfering compounds from the matrix are avoided, and a selective concentration from 100 to 5000 times is achieved, the method being able to isolate even traces.

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