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Published on: August 29, 2014
Assessing PCB pollution in the Baltic Sea - An equilibrium partitioning based study.
Susann-Cathrin Lang1, Philipp Mayer2, Andrew Hursthouse3
1University of Applied Sciences Hamburg, Department of Environmental Engineering, Ulmenliet 20, 21033 Hamburg, Germany; Institute of Biomedical and Environmental Health Research, School of Science & Sport, University of the West of Scotland, Paisley Campus, Paisley PA 1 2BE, United Kingdom.
This study measured polychlorinated biphenyls (PCBs) in Baltic Sea sediments using a novel sampling method. PCB contamination varied regionally, with higher levels found in the western Baltic Sea.
Area of Science:
- Environmental Chemistry
- Marine Science
- Analytical Chemistry
Background:
- Polychlorinated biphenyls (PCBs) are persistent organic pollutants with significant environmental and health concerns.
- Understanding PCB distribution and bioavailability in marine sediments is crucial for risk assessment.
- Previous methods for assessing PCB bioavailability have limitations in sensitivity and spatial resolution.
Purpose of the Study:
- To quantify freely dissolved PCB concentrations in Baltic Sea sediments.
- To assess PCB toxicity potential and thermodynamic behavior.
- To evaluate a novel sampling method for trace-level hydrophobic organic chemicals.
Main Methods:
- Analysis of sediment cores and bottom water samples for seven indicator PCBs.
- Ex-situ equilibrium sampling using polydimethylsiloxane (PDMS) coated glass fibers.
- Automated thermal desorption gas chromatography-mass spectrometry (GC-MS) for quantifying PCB concentrations in PDMS (CPDMS) and total sediment (CT).
Main Results:
- Spatially resolved freely dissolved PCB concentrations were determined.
- Baseline toxicity potential (chemical activities) and site-specific distribution ratios (KD) were calculated.
- PCB contamination levels were low in the Gulf of Finland, moderate to elevated in the Baltic Proper, and highest in the western Baltic Sea.
Conclusions:
- The SPME method is a sensitive and appropriate tool for PCB area surveys in marine environments.
- This approach provides new opportunities to study in-situ distribution and thermodynamics of hydrophobic organic chemicals at trace levels.
- Regional variations in PCB contamination highlight the need for targeted management strategies in the Baltic Sea.
