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Tanaka, Tadao; Nagao, Seiya; Sakamoto, Yoshiaki; Ogawa, Hiromichi
Journal of Nuclear Science and Technology, 39(Suppl.3), p.524 - 527, 2002/11
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.
Jiang, Q.*; Tamura, Kenji*; Asano, Maki*; Fukuyama, Kenjin*; Yamaji, Keiko*
no journal, ,
This study was conducted to understand the soil macro and micromorphological characteristics on the former open pit mining area of Ningyo-toge mine. The vegetation succession of the area has not progressed. Its dominant vegetation has been 
. The conclusions of this study are follows. The BC horizon of Site B has a lower Eh, which may be due to the less voids in the underlying soil, which results in seasonal accumulation of water. The contents of Mn, Cd, Pb, and Co were higher than the average contents in Japanese soil, but they did not reach the level of pollution. The content of acid-soluble Fe was very low in the soil, Fe mainly is the form of residual and a part of reducible form in the study site. But, the content of Mn in acid-soluble form is high, and Mn has a greater impact on vegetation. In this study site, external human factors have a large influence, mixed with a large amount of black residue and wood chips. And the 0-5cm of soil is in good structure, but the soil in the lower layer is not fully developed and it is a block structure.
