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Speciation of Eu$$^{3+}$$ bound to humic substances by time-resolved laser fluorescence spectroscopy (TRLFS) and parallel factor analysis (PARAFAC)

時間分解蛍光分光法とパラレル因子分析法によるフミン酸に結合したユウロピウムイオンの化学種に関する研究

Lukman, S.*; 斉藤 拓巳*; 青柳 登   ; 木村 貴海 ; 長崎 晋也*

Lukman, S.*; Saito, Takumi*; Aoyagi, Noboru; Kimura, Takaumi; Nagasaki, Shinya*

The bioavailability and the toxicological properties of metal ions, including radionuclides, in the biosphere are greatly influenced by the speciation. This is especially critical in evaluating the feasibility of nuclear waste disposal where the understanding of radionuclide migration through geosphere from engineering barriers is one of the keys for performance assessment. Organic matters are important constituents of groundwater and have significant impact on the speciation and thus mobility of radionuclides, among which are humic substances (HSs) because of their high affinity to metal ions. In this study, europium (Eu$$^{3+}$$) is used as the chemical homologue of trivalent actinides (An$$^{3+}$$), to understand the speciation of An$$^{3+}$$ when it interacts with HSs collected from various origins. TRLFS is used for the speciation study owing to its high sensitivity and selectivity to differentiate multiple species co-existing simultaneously. The interpretation of the Eu$$^{3+}$$ species, denoted as Factor A, B and C, was tackled by Principal Component Analysis (PCA) and Partial Linear Square (PLS) Regression to deduce the nature of Eu$$^{3+}$$ species formed by taking into account the physicochemical properties of HSs that influence each species luminescence characteristics.

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パーセンタイル:53.89

分野:Geochemistry & Geophysics

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