Journal
MARINE POLLUTION BULLETIN
Volume 74, Issue 1, Pages 125-131Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2013.07.018
Keywords
Resin pellet; Polyethylene; Marine debris; Polychlorinated biphenyl (PCB); Aqueous boundary layer
Funding
- Mitsui 82 Co., Ltd., Environment Fund [R11-G4-1053]
- Ministry of Education and Culture of Japan [22254001]
- Grants-in-Aid for Scientific Research [23310046] Funding Source: KAKEN
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This study investigated the desorption behavior of polychlorinated biphenyls (PCBs) from marine plastic pellets. Long-term desorption experiments were conducted using field-collected polyethylene (PE) pellets. The results indicate that the desorption kinetics highly depends on the PE-water partition coefficients of PCB congeners. After 128 d of the experiment, the smallest congener considered (CB 8) had desorbed nearly completely (98%), whereas major fractions (90-99%) of highly chlorinated congeners remained in the pellets. An intraparticle diffusion model mostly failed to reproduce the desorption kinetics, whereas an aqueous boundary layer (ABL) diffusion model well approximated the data. The desorption half-lives are estimated to 14d to 210 years for CB 8 to CB 209 in an actively stirred solution (ABL thickness: 30 mu m). Addition of methanol to water enhanced the desorption to a large extent. A need for further work to explore roles of organic matter in facilitating solute transfer is suggested. (C) 2013 Elsevier Ltd. All rights reserved.
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