Biomagnification profiles of tributyltin (TBT) and triphenyltin (TPT) in Japanese coastal food webs elucidated by stable nitrogen isotope ratios |
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Authors: | Murai Ryota Sugimoto Atsuko Tanabe Shinsuke Takeuchi Ichiro |
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Institution: | aDepartment of Life Environment Conservation, Faculty of Agriculture, Ehime University, Tarumi, Matsuyama, Ehime 790-8566, Japan;bGraduate School of Environmental Science / Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;cCenter for Marine Environmental Studies, Ehime University, Bunkyo-cho, Matsuyama Ehime 790-8577, Japan |
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Abstract: | The measurement of organotins in the various biotas of coastal food webs with stable nitrogen isotope ratios (δ15N), which increase 3.4‰ per trophic level, can provide a biomagnification profile of organotins through food web. In this study, various biological samples were collected from three localities in Western Japan between 2002 and 2003 for analyses. Tributyltin (TBT) and triphenyltin (TPT) were still detected with a maximum of 99.5 and 8.7 ng wet weight g−1, respectively. Unlike TBT, significant biomagnification of TPT through the food web (expressed by δ15N) was found in all three localities. The log transformed octanol–water partition coefficient (log Kow) of TPT of 2.11–3.43 was overlapped by, but was slightly lower than, that of TBT of 3.70–4.70. Thus, this study demonstrates that although these chemicals have a log Kow lower than 5, at least TPT undergoes significant biomagnification through the food web. |
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Keywords: | Biomagnification Food web Stable nitrogen isotope ratio TBT TPT |
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