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Comparison of the vertical distributions of Fukushima nuclear accident radiocesium in soil before and after the first rainy season, with physicochemical and mineralogical interpretations

Matsunaga, Takeshi; Koarashi, Jun  ; Atarashi-Andoh, Mariko ; Nagao, Seiya*; Sato, Tsutomu*; Nagai, Haruyasu 

The effect of intensive rainfall in the on distribution of Fukushima accident-derived $$^{137}$$Cs in soil was examined in Fukushima-city in post-rainy season and were compared with those in pre-rainy season. It is concluded that rainfall during the rainy season had a limited effect on $$^{137}$$Cs distribution in soil, indicating its overall immobility. Chemical extraction of $$^{137}$$Cs from selected soil samples indicated that $$^{137}$$Cs in soil was hardly water-soluble and extractable with 1M ammonium acetate. This supports the overall immobility of $$^{137}$$Cs in our soils. No direct relationship was obtained between the mineral composition and the $$^{137}$$Cs retention in upper soil layer. In contrast, positive correlations were found between the $$^{137}$$Cs extractability and soil properties such as pH, organic matter content, and finer-sized particle contents in the soils. These results suggest that the mineralogical effect may be masked by non-specific adsorption offered by physicochemical properties of the soils.

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Category:Environmental Sciences

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