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Fate and Mobility of Pollutants in Sediments

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  1. INTERREG III: STARDUST January 2003- September 2003 VLIZ Lille, 18/09/03

  2. Aim • Understanding of fate and mobility of pollutants in sediments • requires high resolution profiles of pollutants Dissolved phase DGT, DET Solid phase Laser ablation ICPMS Lille, 18/09/03

  3. High resolution profiles in the solid phase • Sediment impregnation techniques: 2 techniques were tested: • Polyester resin • Polyethylene glycol Tests performed on sediments of the North Sea and the Rupel • Cutting/polishing • Analysis by LA-ICPMS Lille, 18/09/03

  4. Vacuum impregnation in polyester resin -sectioning of core -lyophilisation -vacuum impregnation: polester, aceton, hardener Lille, 18/09/03

  5. Vacuum impregnation in polyester resin Problems encountered: -amount of hardener, aceton; impregnation time has to be optimised for different sediment types: low porosity samples require more aceton, less hardener and longer impregantion time relatively easily solved Lille, 18/09/03

  6. Polyethyleneglycol (PEG) impregnation • Equilibation of porewater with PEG for 3 to 5 weeks at 50°C • Lyophilisation Lille, 18/09/03

  7. Polyethyleneglycol (PEG) impregnation Problems encountered -very slow method (3-5 weeks) -evaporation of PEG -optimal concentration of PEG depends on nature of the sample -good results for sandy marine sediment -poor results for muddy sediments, especially Rupel Lille, 18/09/03

  8. Rupel sediment after polyester impreganation cut in 4cm sections with a diamond cutter Lille, 18/09/03

  9. LA- ICPMS analysis compared to classical digestion-ICPMS Lille, 18/09/03

  10. LA- ICPMS analysis Problems encountered -choice of internal standard: spiked with In, Re or major element with constant concentration (Ca,P, …) -choice of standard: better results with polyester impregnated reference sediment than with LA glass standard -validation of high resolution profiles: comparison with other methods (Synchroton XRF) are being performed Lille, 18/09/03

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