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Sorption behavior of plutonium(IV) onto soils in the presence of humic acid

フミン酸共存下でのPu(IV)の土壌への吸着挙動

田中 忠夫; 長尾 誠也; 坂本 義昭; 小川 弘道

Tanaka, Tadao; Nagao, Seiya; Sakamoto, Yoshiaki; Ogawa, Hiromichi

Puの吸着に及ぼすフミン酸の影響について、フミン酸を吸着しない海岸砂及びフミン酸を良く吸着するクロボク土を用いてフミン酸の分子サイズとの関連から検討した。Puの海岸砂への吸着能はフミン酸濃度が高くなるにしたがって低下した。一方、クロボク土への吸着能は極低濃度のフミン酸を共存する場合に最も高くなり、フミン酸濃度の増加とともに減少した。また、吸着前後における液相中のPuとフミン酸の分子サイズを限外濾過法によって調べた結果、フミン酸のPuとの錯形成能と土壌への吸着能は分子サイズによって異なり、これらに支配的な分子サイズはフミン酸濃度が高くなるにしたがって小さなサイズ領域にシフトすることを明らかにした。

Influence of humic acid on the sorption of Pu onto a coastal sand, which does not sorb humic acid, and an ando soil, which sorbs humic acid very well, was examined with respect to molecular sizes of humic acid. Sorption affinity of Pu for the coastal sand decreased with increasing humic acid concentration. As to the ando soil, the sorption affinity of Pu in the presence of humic acid was larger than that in the absence of humic acid, in low humic acid concentration range. These results suggest that apparent sorption affinity of Pu on the soils is dependent on the complexation ability with humic acid and the sorption affinity of the resulting humic complexes. Concentration profiles of Pu in each size fraction of solution before and after the sorption experiment were obtained by ultrafiltration technique. It was found that the complexation and sorption properties of humic acid are dependent on its molecular size and the important molecular size relating to the complexation and sorption properties tends to shift into smaller size ranges with increasing humic acid concentration.

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