INVESTIGATIONS ON THE SUPERCRITICAL-FLUID EXTRACTION OF SPIKED ORGANIC POLLUTANTS FROM WET SOILS

The possibility of a fractionation (sequential extraction) of certain groups of compounds has been investigated during supercritical fluid e xtraction (SFE) from wet and dry wetland-soils. The classes of compoun ds considered are chlorinated hydrocarbons on the one hand and nitroge n- or phosphorus-containing pesticides (N/P-pesticides) on the other h and. The results show the great influence of water on the efficiency o f the extraction and the limited possibility of attaining a fractionat ion during the extraction.