Respiratory Uptake and Depuration Kinetics of Perfluorooctanesulfonate (PFOS) in a Marine Sandworm Species |
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Authors: | Takeo Sakurai Jun Kobayashi Nozomi Ito Shigeko Serizawa Hiroaki Shiraishi Tohru Yabe Yuichi Ishii Noriyuki Suzuki |
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Institution: | 1.National Institute for Environmental Studies,Tsukuba,Japan;2.Prefectural University of Kumamoto,Kumamoto,Japan;3.Tokyo Metropolitan Research Institute for Environmental Protection,Tokyo,Japan |
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Abstract: | We determined the respiratory uptake and depuration kinetics of perfluorooctanesulfonate (PFOS) in Perinereis wilsoni, a polychaete sandworm used as a model species to investigate the fate of chemical pollutants in coastal environments. The sandworms were kept in gravel-packed containers, and the water levels were varied cyclically to mimic the tides. We used seawater kept at 17.1°C. A 7-day exposure period was followed by a 9-day depuration period. The dissolved PFOS concentration averaged 28 ng/L during the exposure period. Sandworm samples were collected regularly for analysis of PFOS concentrations, and a first-order-kinetics model was applied to the concentrations. The respiratory absorption efficiency of PFOS was estimated to be 11% that of oxygen, which is higher than the corresponding estimates reported for several fish species. The estimated depuration half-life of 15 days was comparable to previously reported estimates for fish and oligochaete species. The bioconcentration factor was 470. |
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