@misc{oai:repo.qst.go.jp:00068599,
 author = {Ishikawa, Nao and Uchida, Shigeo and Tagami, Keiko and Nakamaru, Yasuo and 石川 奈緒 and 内田 滋夫 and 田上 恵子 and 中丸 康夫},
 month = {Jul},
 note = {Selenium (Se) is one of the elements that are included in environmental quality standards for soils because it is highly toxic to humans. Although natural Japanese soils do not have a high Se content, Se contamination of soils will become a big problem because its consumption for industrial purposes is increasing. From the viewpoint of radioactive waste management, the fate of the element in a soil environment is also interesting because the long-lived fission product Se-79 (half-life: 1.1 million y) is an important radionuclide for long-term dose assessment. Soil organic substances influence pollutant sorption on soil. Recently, many studies have shown that humic acid (HA), a soil organic substance, adsorbs some radioactive elements, such as U and Am. However, no study has been carried out for Se adsorbability onto HA or for the sorption kinetics. Thus, our aim in this study was to clarify the sorption behavior of Se on HA. We investigated influences of solid-liquid ratios and Se concentrations by measuring the amount of Se sorbed on HA and the time to reach the sorption equilibrium. We also determined size distributions of HA-sorbed-Se under increasing HA amounts and co-existing Se amounts using an ultrafiltration technique. Finally, we looked at a suitable determination method for Se concentration in the liquid phase to obtain an isotherm equation., 18th World Congress of Soil Science},
 title = {Sorption behavior of selenium on humic acid under increasing Se or humic acid content},
 year = {2006}
}