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Tanaka, Takuro*; Fukuoka, Masafumi*; Toda, Kanako*; Nakanishi, Takahiro; Terashima, Motoki; Fujiwara, Kenso; Niwano, Yuma*; Kato, Hiroaki*; Kobayashi, Natsuko*; Tanoi, Keitaro*; et al.
ACS ES&T Water (Internet), 4(8), p.3579 - 3586, 2024/08
Cs, 2; Application of DGT for Fukushima environmentsFukuoka, Masafumi*; Saito, Takumi*; Fujiwara, Kenso; Iijima, Kazuki
no journal, ,
Among the Cs incorporated into the soil solid phase, cations in the soil liquid phase and easily with the cation in the soil liquid phase, in order to understand the change in pollution due to the absorption of Cs by animals and plants and the movement of Cs into or around the forest environment. It is important to evaluate replacement active components that are interchangeable. In this study, we use a device called "Differentives in thin films (DGT)" to sample substitutional components of trace metal ions in the environment, and perform in situ evaluation of substitutional components of Cs. In this presentation, basic tests using DGT devices for Cs were conducted near the Fukushima Daiichi Nuclear Power Station.
Tanaka, Takuro*; Saito, Takumi*; Toda, Kanako*; Fujiwara, Kenso; Terashima, Motoki; Nakanishi, Takahiro; Kobayashi, Natsuko*; Tanoi, Keitaro*
no journal, ,
Cs-137 dispersed by the Fukushima Daiichi Nuclear Power Plant accident deposited in Fukushima area, that are not decontaminated in mountainous areas, may migrate through river water to animals and plants. Most of Cs-137 in river are fixed in clay minerals, but there are some Cs that can be easily desorbed, named as labile components. It has been suggested that labile components affect the bioavailability of Cs-137. In this study, the labile Cs-137 was sampled in situ from upstream to downstream in several rivers of Fukushima using a passive sampler called diffusive gradients in thin films (DGT). Sampling was conducted at a different season in addition to the previous studies.
Saito, Takumi*; Fukuoka, Masafumi*; Fujiwara, Kenso
no journal, ,
Environmental behaviors of radioactive Cs is crucial to predict long-term changes of its distribution in soil or river environments. It is known that Cs is selectively bound to micaceous minerals in nature and inert for chemical exchange reactions. Nevertheless, dynamics of labile fractions of Cs in a given environment if any must play an important role for its environmental behaviors, as it directly contributes to the mobility and bioavailability of Cs. In this study, we perform in-situ evaluation of the labile Cs in soil and aqueous environments of Fukushima Prefecture by diffusive gradients in thin films (DGT), which is a technique designed for the lability measurement of trace elements in nature. In river environments exceeds the dissolved ones, suggesting that the desorption of Cs from suspended particles modulates its behaviors in river water. Meanwhile, in soils we have found that the distribution of the labile fraction of radioactive Cs is heterogeneous with particulate materials rich in labile Cs and that the proportion of the labile Cs in a soil column becomes large at the depth deeper than 5 cm from the surface.
Cs in Fukushima rivers by diffusive gradients in thin films (DGT), 3; Relations between geochemical parametersTanaka, Takuro*; Saito, Takumi*; Toda, Kanako*; Fujiwara, Kenso; Terashima, Motoki; Nakanishi, Takahiro; Kobayashi, Natsuko*; Tanoi, Keitaro*; Kato, Hiroaki*
no journal, ,
Cs dispersed by the Fukushima Daiichi Nuclear Power Plant accident deposited in Fukushima area, that are not decontaminated in mountainous areas, may migrate through river water to animals and plants. Most of Cs in river are fixed in clay minerals, but there are some Cs that can be easily desorbed, named as labile components. It has been suggested that labile components affect the bioavailability of Cs. In this study, the labile Cs was sampled in situ from upstream to downstream in several rivers of Fukushima using a passive sampler called diffusive gradients in thin films (DGT). The desorption behavior of the labile component and factors affecting it will be discussed by examining the relationship with particulate Cs and geochemical parameters in river water.
