Mercury and its relation with selenium in the liver of Dall's porpoises (Phocoenoides dalli) off the Sanriku coast of Japan

文献类型： 外文期刊

第一作者： Yang, Jian

作者： Yang, Jian;Kunito, Takashi;Tanabe, Shinsuke;Miyazaki, Nobuyuki

作者机构：

关键词： Dall's porpoises;Detoxification;Equimolar accumulation;Mercury;Selenium

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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年卷期：

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收录情况： SCI

摘要： Liver samples of 22 Dall's porpoises (Phocoenoides dalli) collected off the Sanriku coast of Japan were analyzed for investigation on bioaccumulation of total mercury (ΣHg), organic mercury (OrgHg), inorganic mercury (InHg) and selenium (Se). In the liver, detoxification of Hg was evident by transformation of OrgHg. Se showed different Hg detoxification patterns in the liver with a threshold range of hepatic ΣHg concentration of about 20–30 μg/g dry weight. The molar ratios of Se/InHg or Se/ΣHg were obviously higher than 1 when hepatic ΣHg levels were less than the range, while both ratios were close to 1 when ΣHg levels were higher than the threshold, suggesting a mechanism by detoxification of OrgHg into less toxic mercuric selenide (HgSe) forms in the latter. The range of 20–30 μg/g dry weight of hepatic total Hg was probably a threshold range for co-accumulation of Se and inorganic Hg in ca 1:1 molar ratio for Dall's porpoise.

分类号： X5

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