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Report No.
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Colloidal solutes transport processes in deep groundwater

Iwatsuki, Teruki; Kubota, Mitsuru; Hayashida, Kazuki; Kato, Toshihiro

We studied colloidal solutes transport in deep groundwater at depths of 500 m in Mizunami Underground Research Laboratory. Colloidal phases consist of silicate minerals, calcite, iron-hydroxides were observed in groundwater. Those particles possibly transport 10-80 % of metal elements and rare earth elements. In the closed drift, colloidal phases consist of biofilms, ZnS were observed. Since the concentration of rare earth elements are considerably low, rare earth elements with solute and colloidal phases probably absorbed on cementing materials, clay materials in closed drift.

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