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Size and elemental analyses of nano colloids in deep granitic groundwater; Implications for transport of trace elements

深部花崗岩地下水中に存在するコロイドのサイズ及び元素分布; 微量元素の移行との関係について

斉藤 拓巳*; 鈴木 庸平*; 水野 崇

Saito, Takumi*; Suzuki, Yohei*; Mizuno, Takashi

瑞浪超深地層研究所の深度300mから採取した地下水中のコロイドのサイズ分布を把握するため、流体流動場分画法を用いた研究を行った。比較的低濃度に分布するコロイドを分析するため、限外ろ過、大規模なインジェクションループ及びスロットフローにより濃縮し、分析を行った。無機もしくは有機コロイドはUV/Vis及び蛍光検出器、さらには誘導結合プラズマ質量分析装置を流体流動場分画装置と接続し分析した。その結果、ランタニド(La, Ce, Eu, Lu)やアクチニド(U, Th)、重金属元素(Cu, Zn, W)といった元素がサイズ依存性を持って分布していることがわかった。

Nano colloids in granitic groundwater obtained from a borehole located at the -300-m stage of the Mizunami Underground Research Laboratory were studied in terms of their size distributions by flow-field flow fractionation. In order to deal with relatively low concentrations of colloids, colloids were enriched first by ultrafiltration, and then by in-situ enrichment using a large injection loop and the slot flow technique. The size distributions of organic and inorganic constituents of colloids were measured by UV/Vis, fluorescence and inductively coupled plasma mass spectrometry, from which possible association of trace elements with host colloidal phases consisting of major elements and organic materials was discussed. Trace elements, namely, Sr, lanthanides (La, Ce, Eu, Lu), actinide elements (U, Th) and heavy metals (Cu, Zn and W), exhibited distinct size distributions, reflecting their preferential association with certain host colloidal phases.

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