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Chemical implication of the partition coefficient of 137Cs between the suspended and dissolved phases in natural water.
Hirose, Katsumi; Onda, Yuichi; Tsukada, Hirofumi; Hiroyama, Yuko; Okada, Yukiko; Kikawada, Yoshikazu.
Afiliación
  • Hirose K; Laboratory for Environmental Research at Mount Fuji, Shujyuku-ku, Tokyo, 169-0072, Japan. Electronic address: hirose45037@mail2.acccsnet.ne.jp.
  • Onda Y; Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Tsukuba, Ibaraki, 305-0006, Japan.
  • Tsukada H; Institute of Environmental Radioactivity, Fukushima University, Fukushima-City, Fukushima, 960-1296, Japan.
  • Hiroyama Y; Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, Kioi-Cho, Chiyoda-ku, Tokyo, 102-8554, Japan.
  • Okada Y; Atomic Energy Laboratory, Tokyo City University, Ozenji 971, Asao-ku, Kawasaki, 215-0031, Japan.
  • Kikawada Y; Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, Kioi-Cho, Chiyoda-ku, Tokyo, 102-8554, Japan.
J Environ Radioact ; 278: 107486, 2024 Sep.
Article en En | MEDLINE | ID: mdl-38936250
ABSTRACT
After the Fukushima Daiichi nuclear power plant accident, the terrestrial environment became severely contaminated with radiocesium. Consequently, the river and lake water in the Fukushima area exhibited high radiocesium levels, which declined subsequently. The partition coefficient of 137Cs between the suspended sediment (SS) and dissolved phases, Kd, was introduced to better understand the dynamic behavior of 137Cs in different systems. However, the Kd values in river water, ranging from 2 × 104 to 7 × 106 L kg-1, showed large spatiotemporal variability. Therefore, the factors controlling the 137Cs partition coefficient in natural water systems should be identified. Herein, we introduce a chemical model to explain the variability in 137Cs Kd in natural water systems. The chemical model includes the complexation of Cs+ with mineral and organic binding sites in SS, metal exchange reactions, and the presence of colloidal species. The application of the chemical model to natural water systems revealed that Cs+ is strongly associated with binding sites in SS, and a major chemical interaction between 137Cs and the binding sites in SS is the isotope exchange reaction between stable Cs and 137Cs, rather than metal exchange reactions with other metal ions such as potassium ions. To explain the effect of the SS concentration on Kd, the presence of colloidal 137Cs passing through a filter is significant as the dominant dissolved species of 137Cs in river water. These results suggest that a better understanding of stable Cs dissolved in natural water is important for discerning the geochemical and ecological behaviors of 137Cs in natural water.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Radiactivos del Agua / Radioisótopos de Cesio / Monitoreo de Radiación / Accidente Nuclear de Fukushima País/Región como asunto: Asia Idioma: En Revista: J Environ Radioact Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Radiactivos del Agua / Radioisótopos de Cesio / Monitoreo de Radiación / Accidente Nuclear de Fukushima País/Región como asunto: Asia Idioma: En Revista: J Environ Radioact Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido