The role of small,low density particles on the partition of selected PCB congeners between water and suspended matter (North Sea area) |
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| Affiliation: | 1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;3. Exploration Business Division, CNPC Southwest Oil and Gas Field, Chengdu, Sichuan 610500, China;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;3. Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA;4. Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA 70115, USA;5. The Water Institute of the Gulf, Baton Rouge, LA 70825, USA;6. Department of Geological Sciences, University of Alabama, Tuscaloosa, AL 35406, USA;7. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;8. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;9. Qingdao Institute of Marine Geology, Qingdao 266071, China |
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| Abstract: | The dissolved and particulate suspended concentrations of five PCB congeners (with 3–7 chlorine atoms) in the Southern Bight (North Sea) are interpreted in terms of an equilibrium partitioning model. Kd values for riverine/coastal samples generally increase with chlorine number of the congeners (Kd = 104–106). Values are more than an order of magnitude larger at the low suspended matter concentrations offshore (< 1 mg·dm−3). This is interpreted in terms of the presence of different SPM fractions with different contents of PCB: a fraction consisting of low size/density particles carrying high contents of PCBs, dominates at low SPM concentrations. The contribution of particulate forms to the total PCB concentration per unit volume may, therefore, be significant even at low SPM concentrations. |
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