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Sakurai, Takeo,Kobayashi, Jun,Kinoshita, Kyoko,Ito, Nozomi,Serizawa, Shigeko,Shiraishi, Hiroaki,Lee, Jeong-Hoon,Horiguchi, Toshihiro,Maki, Hideaki,Mizukawa, Kaoruko,Imaizumi, Yoshitaka,Kawai, Toru,Suz Wiley Periodicals 2013 Environmental toxicology and chemistry Vol.32 No.9
<P>The authors investigated the kinetics of transfer of perfluorooctane sulfonate (PFOS) from water, suspended sediment, and bottom sediment to a marine benthic fish, the marbled flounder (<I>Pseudopleuronectes yokohamae</I>). Fish were exposed in 3 treatments to PFOS in combinations of these exposure media for 28 d and then depurated for 84 d. A major part (37–66%) of PFOS in the fish was in the carcass (i.e., whole body minus muscle and internal organs). Three first-order-kinetic models that differed in exposure media, that is, 1) sum of dissolved and particulate phases and sediment; 2) dissolved phase, particulate phase, and sediment; and 3) dissolved phase only, were fitted to the data assuming common rate constants among the treatments. The uptake efficiency of dissolved PFOS at the respiratory surfaces was estimated to be 3.2% that of oxygen, and the half-life of PFOS in the whole body to be 29 d to 31 d. The better fit of models 1 and 2 and the values of the estimated uptake rate constants suggested that the PFOS in suspended and bottom sediments, in addition to that dissolved in water, contributed to the observed body burden of the fish. Based on an evaluation of several possible contributing factors to the uptake of PFOS from suspended and bottom sediments, the authors propose that further investigation is necessary regarding the mechanisms responsible for the uptake. <I>Environ Toxicol Chem</I> 2013;32:2009–2017. © 2013 The Authors. <I>Environmental Toxicology and Chemistry</I> Published by Wiley Periodicals, Inc., on behalf of SETAC. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.</P>
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이병천 ( Byoung Cheun Lee ),김수진 ( Sue Jin Kim ),윤준헌 ( Jun Heon Yoon ),김은주 ( Eun Ju Kim ),( Duong NC ),엄익춘 ( Ig Chun Eom ),( Shiraishi F. ),최경희 ( Kyung Hee Choi ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.2
Estrogenic and dioxin activities in river water and effluents of sewage treatment plants were evaluated by different in vitro assays. The expression of β-galatosidase in yeast cells (Yeast two-hybrid assay) was used as an indicator of pollutants effects. Estrogenic activities were estimated using medaka estrogen receptor (mER) and human estrogen receptor (hER) yeast while the dioxin activities were measured by Aryl hydrocarbon receptor (AhR) yeast. Five samples were collected including two river water (RW) samples and three effluents (MW) samples. Target chemicals were extracted using a series of solvents which are hexane/dichloromethane, acetone/dichloromethane and methanol. Standard dose-response curves were established with 3 estrogenic chemicals (estradiol, nonylphenol and bisphenol A) and 3 dioxin-like chemicals (naphthoflavone, comestrol and equol). The results showed that both estrogen receptors (i.e., mER and hER) were suitable to be applied into the assessment of micropollutants` estrogenicity, in which, the sensitivity of mER to estrogenic activity was higher than that of hER. AhR also showed a suitable sensitivity to target dioxins. Estrogenic activity of MW-1 was highest among the samples in both mER and hER yeast assays. The estrogenic activities of two other effluents samples, however, were lower than that of MW-1 and other RW samples. This indicates that river water may receive estrogenic-polluted water other than the effluents of STPs. Similarly, dioxin activities in RW samples were higher than that of effluents. It is suggested that the untreated agriculture wastewater could be the reason. This study contributes to the establishment and application of risk assessment of micropollutant in the environment.