Development of a simple selective SFE method for the determination of desorption behaviour of PCBs in two Swedish sediments.
Författare
Summary, in English
A simple selective supercritical fluid extraction (SFE) method was developed for the determination of desorption behaviour of PCBs in sediments. This method was applied to determine the distribution of individual PCB congeners among sites of differing bonding strengths in two Swedish sediments (Lake Järnsjön and Baltic bay Orserumsviken). Four different PCB fractions were distinguished in each sediment by applying consecutively harsher supercritical fluid extraction conditions on the same sample. Even though the two sediments had completely different textures, they showed very similar extraction behaviour. It was shown that, in both sediments, a major part of the PCBs (58% and 65%, respectively) were located at "fast sites", from which they were extractable already with the mildest extraction conditions (60 min, 40 degrees C and 120 bar). Only a small fraction of the PCBs were so tightly bound to the sediments (located at "slow sites"), that they could be extracted only under the harshest conditions (60 min, 150 degrees C and 400 bar). Information of this kind should be of great value for the determination of bioavailability of pollutants in sediments and soils, and it is the author's belief that this technique has the potential to develop into a powerful tool in environmental risk assessment.
Avdelning/ar
Publiceringsår
2002
Språk
Engelska
Sidor
469-476
Publikation/Tidskrift/Serie
Chemosphere
Volym
46
Issue
3
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Environmental Sciences
Nyckelord
- Analytical/*methods
- Geologic Sediments/*chemistry
- Polychlorinated Biphenyls/*analysis
- Water Pollutants
- Sweden
- Chemical/analysis
- Chemistry
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1879-1298