Remobilization of Polychlorinated Biphenyl from Baltic Sea Sediment: Comparing the Roles of Bioturbation and Physical Resuspension

Hedman, Jenny E.Stockholms universitet,Systemekologiska institutionen (författare)

The release of a C-14-labeled trichlorobiphenyl compound ([C-14]PCB 32) from sediment to water was quantified weekly in a 30-d microcosm experiment with recirculating water. Two modes of bioturbation-driven polychlorinated biphenyl (PCB) release-bioturbation by the amphipod Monoporeia affinis (a particle biodiffuser) and bioturbation by the polychaete Marenzelleria sp. (a bioirrigator)-were compared to the PCB release caused by physical resuspension of the sediment generated by a motor-driven paddle used twice a week. Bioturbation by the amphipod M. affinis caused a significantly higher remobilization of both particle-associated PCB (PCBpart) and dissolved PCB (PCBdiss) than the other treatments. Bioturbation by Marenzelleria sp. and physical resuspension caused a similar release of PCBdiss despite a significantly higher amount of total suspended solids in the water column after physical resuspension. In all treatments, the release of PCBdiss was more than one order of magnitude higher than that of PCBpart, indicating a significant potential route of exposure for pelagic organisms, such as fish, to the most bioavailable PCB form. Calculated mass-transfer coefficients (0.3-1.3 cm/d) correspond to previously reported values for trichlorinated PCBs. The present results indicate that biological reworking of sediments can be just as, or even more, important than physical resuspension for the remobilization of sediment-bound contaminants.

NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
* Flux; * Pollutant; * Benthos; * Invasive species; * Mechanical disturbance
Terrestrial, freshwater and marine ecology
Terrestrisk, limnisk och marin ekologi
Environmental chemistry

Tocca, Julia StempaStockholms universitet,Systemekologiska institutionen (författare)
Gunnarsson, Jonas SStockholms universitet,Systemekologiska institutionen(Swepub:su)jgunn (författare)
Stockholms universitetSystemekologiska institutionen (creator_code:org_t)

Ingår i:Environmental Toxicology and Chemistry: Wiley28:11, s. 2241-22490730-72681552-8618

Av författaren/redakt...: Hedman, Jenny E.; Tocca, Julia Ste ...; Gunnarsson, Jona ...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Miljövetenskap

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