In order to investigate the behavior of rare earth elements (REEs) and uranium (U) in marine organism, the concentrations of REEs and U in some brown algae samples taken on the coast of Niigata Prefecture were determined. In addition, laboratory model experiment to uptake these elements using living and dried algae (Undaria pinnatifida and Sargassum hemiphyllum) was also carried out to survey the uptake and bioaccumulation mechanism of REEs and U in algae. Consequently, the following matters have been mainly clarified. (1) The order of the concentration of REEs for each organ in Sargassum hemiphyllum is "main branch" > "leaf" > "vesicle," however for U, the order is "leaf" > "vesicle" > "main branch." (2) The concentration of REEs in Sargassum hemiphyllum may be strongly affected by suspended solid in seawater. (3) The uptake and/or accumulate mechanism of REEs in brown algae may be different from that of U.

中文翻译：

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利用藻类生物质对铀和稀土元素进行生物吸附。

为了研究稀土元素（REEs）和铀（U）在海洋生物中的行为，测定了在新泻县海岸采集的一些褐藻样品中稀土元素和铀的浓度。此外，还开展了活藻和干藻（裙带菜和半叶马尾藻）吸收这些元素的室内模型实验，研究了藻类中稀土元素和铀的吸收和生物富集机制。因此，主要澄清了以下事项。(1) 半叶马尾藻各器官REEs浓度顺序为“主枝”>“叶”>“囊泡”，而U则为“叶”>“囊泡”>“主枝”。(2) 半叶马尾藻中稀土元素的浓度可能受海水中悬浮固体的强烈影响。(3) 褐藻对稀土元素的吸收和/或积累机制可能与U不同。