土壌中元素濃度分布マッピングシステムによる放射性核種の移動性評価(日本土壌肥料学会2005年度大会プログラム)

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In order to evaluate the environmental behavior of contaminants such as radionuclides, we collected soil samples throughout Japan and measured their characteristics. The characteristics include CEC, soil pH, exchangeable Ca and K, concentrations of major elements (e.g., Al, Fe, Mg and Mn) and trace elements (e.g., Cs, Se, Co, Th and U). The soil-soil solution distribution coefficients (K_ds) of some radionuclides were also determined in our institute. Using these data sets, a mapping system to show distributions of elements, radionuclides and related data (e.g., CEC, pH and K_d) in soil was developed, which is called MdSoiL. MdSoiL is a set of databases of soil characteristics data and a mapping system to make contour maps of the data using inverse distance weighting to visualize the geographic distribution of the data. For example, the contour map of K_d values for Se (K_d-Se) is made without obtaining K_d-Se data for all Japanese soils to evaluate the mobility of Se in Japanese soils. The K_d value is defined as "concentration of an element in or on the soil solid phase" divided by "concentration of the element in the soil solution." The contour map showed that the K_d-Se was higher in Kyushu, Kanto and Tohoku districts than in Chugoku, Shikoku and Kansai districts. This trend corresponded with the geographic distribution of volcanic ash soil. It is known that the Se sorption level is relatively higher in volcanic ash soils than other soil groups in Japan, because volcanic ash soils contain large amounts of active Al. Subsequently, the Se mobility differences among districts were clearly observed due to the geographic distribution of soil types. Thus, MdSoiL is a useful tool to evaluate environmental behaviors of contaminants.
社団法人日本土壌肥料学会の論文
2005-08-05

土壌中元素濃度分布マッピングシステムによる放射性核種の移動性評価(日本土壌肥料学会2005年度大会プログラム)

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