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Abstract

Sediments are the primary reservoir of lipophilic xenobiotic contaminants in aquatic systems, and a long term assessment of the environmental quality of these systems can be made through the measurements of these contaminants in the sediments. One of the major problems in multiresidual analysis of sediment results from interferences posed by elemental sulphur, which occurs as a result of anoxic degradation of biological matter. These interferences are a serious problem when an electron capture detector (ECD) or a flame photometric detector (FPD) is used as the monitoring device during the gas chromatographic analysis. The normal methodology for removal of sulphur from sediment extract is treatment of the extract with metallic mercury or copper. The treatment results in conversion of soluble sulphur to insoluble sulphides which are readily removed as precipitates. This methodology is quite effective in removing sulphur; however, the treatment leads to degradation of a number of pesticides and chemicals of environmental interest. An alternative to the treatment of extract with metal is now being evaluated. This procedure is based on preferential extraction of non-polar analytes by supercritical fluids. The objective of the present study was to explore the applicability of selective supercritical fluid extraction (SFE) for elimination or reduction of sulphur interference.

Additional information

Authors: NAM K S, University of Missouri, Environmental Trace Substances Research Center, Columbia (US);KAPILA S, University of Missouri, Environmental Trace Substances Research Center, Columbia (US);PURI R K, University of Missouri, Environmental Trace Substances Research Center, Columbia (US);YANDERS A F, University of Missouri, Environmental Trace Substances Research Center, Columbia (US);LARSEN B R, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 12th International Symposium on Chlorinated Dioxins and Related Compounds, Tampere (FI), August 24-28, 1992
Availability: Available from (1) as Paper EN 36899 ORA
Record Number: 199210815 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en