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Eu(III) binding abilities of dissolved humic substances isolated from deep groundwater in Horonobe area, Hokkaido, Japan

幌延深部地下水に由来する溶存腐植物質のEu(III)結合能

寺島 元基  ; 清田 佳美; 岩月 輝希  ; 飯島 和毅  ; 吉川 英樹; 油井 三和; 長尾 誠也*

Terashima, Motoki; Seida, Yoshimi; Iwatsuki, Teruki; Iijima, Kazuki; Yoshikawa, Hideki; Yui, Mikazu; Nagao, Seiya*

土壌や河川に由来する腐植物質の金属イオン結合能についての知見は、必ずしも深部地下環境に由来する腐植物質に適用できるとは限らない。本研究では、幌延深地層研究センター敷地内地下水から腐植物質を分離・精製し、蛍光消光法により地下水に由来する腐植物質のEu(III)結合能について調査した。結果、深部地下水に由来する腐植物質は、Aldrichフミン酸とは異なる結合能を有することを明らかにした。

Eu(III) binding abilities of dissolved humic substances (HSs), which were extracted from deep groundwater in the Horonobe Underground Research Center, Hokkaido, Japan, were investigated by fluorescence quenching technique. In the synthetic groundwater condition, the fluorescence quenching due to the binding with Eu(III) was not observed for the groundwater HSs, while that was observed for the Aldrich humic acid (HA). This result indicates that the binding ability of the groundwater HSs are different from that of Aldrich HA. Based on structural characteristics of the groundwater HSs, the differences in the binding ability are discussed.

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