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Field tests on Ce transfer in natural loess environments

黄土中Ce移行に関する野外試験

田中 忠夫; 向井 雅之; 馬場 恒孝

Tanaka, Tadao; Mukai, Masayuki; Bamba, Tsunetaka

酸化還元に鋭敏なCeの環境中での移行挙動を調べるための野外試験を中国黄土高原の帯水層中で実施した。また、移行評価に必要な分配係数等のパラメータを得るため、実験室にてカラム移行実験及びバッチ収着実験を実施した。バッチ収着実験から、Ceは黄土表面で3価から4価へ酸化され、また非可逆的に収着することがわかった。野外でのCeの移行は、この非可逆的な収着を反映して遅く、その移行挙動は分配係数を用いる従来の移行評価式で保守的に評価できることを確認した。

Migration behavior of Ce, one of redox-sensitive elements, was studied in natural aquifer loess zone in P.R.China. Migration parameters such as distribution coefficient were obtained by column migration and batch sorption tests. The batch sorption test indicates Ce is irreversibly incorporated near loess surface as Ce(IV). Cerium showed large retardation in migration in the aquifer loess zone. Predicted migratory mobility of Ce in the aquifer, which was calculated by using the distribution coefficient determined by the batch and column tests, could reproduce that in the field test conservatively.

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