The distribution coefficient for cesium in different clay fractions in soils developed from granite and Paleozoic shales in Japan(Soil chemistry and soil mineralogy)

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• The distribution coefficient of cesium (Cs) (Kd^<Cs>) was investigated for clays which were collected from upland forest soils developed from granites and Paleozoic shales in Japan. They were divided into three size fractions, coarse (2.0-1.0μm), medium (1.0-0.2μm), and fine-clay fractions (<0.2μm), abbreviated CC, MC, and FC, respectively. The Kd^<Cs> value increased in the fractions as follows: FC<MC<CC in all the horizon samples. The amount of potassium (K) in the clay fractions also followed this same pattern. As the amount of K in the clay fraction can be a quantitative indicator of illitic minerals, the positive relationship between the Kd^<Cs> and the amount of K indicated that the coarser clay fraction had a higher ^<137>Cs adsorption potential due to containing higher amounts of illitic minerals. The soil clay fraction from the Paleozoic shales both contained a large amount of K and showed greater Kd^<Cs> values than that of the granite when comparing the same particle sizes. Hence, the type of parent material can be a significant factor in determining the ^<137>Cs adsorption potential of the soils. In all particle fractions, those collected from deeper in the profile had smaller Kd^<Cs> values than those from closer to the soil surface in the same profile, although amount of K present was similar. The X-ray diffraction (XRD) analysis showed that the hydroxy-aluminum (Al) polymer was present in the 2:1 interlayer sites to a greater extent in the clay fractions from deeper in the soil profile than in those from upper in the same soil profile. This result suggests that the hydroxy-Al polymers may be fixed at the expanded weathering front of the illitic minerals, blocking Cs adsorption on the frayed edge sites of these minerals. Thus, the Kd^<Cs> value of the soil clays is determined by the degree of illitic minerals and hydroxy-Al interlayering present, with the larger the amount of illitic minerals the greater the Cs adsorption potential (with any hydroxy-Al interlayering reducing this effect).

• 一般社団法人日本土壌肥料学会の論文
• 2012-08-00

著者

• Funakawa Shinya

  Graduate School Of Agriculture Kyoto University

• Kosaki Takashi

  Graduate School Of Agriculture Kyoto University

• Tsukada Hirofumi

  Department Of Radioecology Institute For Environmental Sciences

• Takeda Akira

  Department Of Gastroenterology Osaka General Medical Center

• TSUKADA Hirofumi

  Department of Radioecology, Institute for Environmental Science

• 中尾 淳

  Graduate School of Agriculture, Kyoto University

• 中尾 淳

  Graduate School of Agriculture, Kyoto University:(Present office)Graduate School of Life and Environmental Sciences, Kyoto Prefectural University

• TAKEDA Akira

  Department of Radioecology, Institute for Environmental Science

• Takeda Akira

  Department of Applied Chemistry, Faculty of Engineering, Okayama University

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