Details

Autor(en) / Beteiligte

• Niehus, Nora Claire
• Schäfer, Sabine
• Möhlenkamp, Christel
• Witt, Gesine

Titel

Equilibrium sampling of HOCs in sediments and suspended particulate matter of the Elbe River

Ist Teil von

• Environmental sciences Europe, 2018, Vol.30 (1), p.28-28, Article 28

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Link zum Volltext

Quelle

SpringerNature Journals

Beschreibungen/Notizen

• Background Chemical quality of sediment and suspended particulate matter (SPM) is usually assessed by total chemical concentrations ( C total ). However, the freely dissolved concentration ( C free ) is the ecologically more relevant parameter for bioavailability, diffusion and bioaccumulation. In recent studies, equilibrium sampling has been applied to determine C free of hydrophobic organic contaminants (HOCs) in the sediment pore water, whereas such data are missing for SPM. We applied solid-phase micro-extraction to measure and compare C free of PAHs and PCBs in pore water of sediments and SPM sampled along the German part of the river Elbe. Moreover, site-specific distribution ratios were evaluated and C bio,lipid was predicted using C free . Results C free of PAHs remained largely constant while C free of PCBs varied along the Elbe River. The highest C total of PCBs and PAHs were found at Prossen (km 13) and Meißen (km 96). PCB C total even exceeded the environmental quality standard for sediment and SPM in Prossen. Site-specific distribution ratios ( K D ) revealed a stronger sorption for PAHs compared to PCBs, indicating a higher availability of PCBs. Equilibrium partitioning concentrations in lipids ( C lip↔sed ) showed a high correlation with actually measured lipid-normalised concentrations ( C bio,lipid ) in bream. This indicates that PCB bioaccumulation in this benthic fish species is closely linked to the sediment contamination. Conclusions In rivers, SPM functions as a transportation vehicle for HOCs along the stream until it eventually deposits to the sediment. This study demonstrates that due to weaker sorption of PAHs and PCBs to the SPM this matrix poses a higher risk to the aquatic environment compared to the sediment. The prediction of C bio,lipid of PCBs was correct and shows that solid-phase micro-extraction is highly suited to predict lipid concentration, and thus a valuable tool for risk-assessment or sediment management.