Abstract:
:The Fukushima Daiichi nuclear power plant accident caused serious radiocesium (137Cs) contamination of the soil in multiple terrestrial ecosystems. Soil is a complex system where minerals, organic matter, and microorganisms interact with each other; therefore, an improved understanding of the interactions of 137Cs with these soil constituents is key to accurately assessing the environmental consequences of the accident. Soil samples were collected from field, orchard, and forest sites in July 2011, separated into three soil fractions with different mineral-organic interaction characteristics using a density fractionation method, and then analyzed for 137Cs content, mineral composition, and organic matter content. The results show that 20-71% of the 137Cs was retained in association with relatively mineral-free, particulate organic matter (POM)-dominant fractions in the orchard and forest surface soil layers. Given the physicochemical and mineralogical properties and the 137Cs extractability of the soils, 137Cs incorporation into the complex structure of POM is likely the main mechanism for 137Cs retention in the surface soil layers. Therefore, our results suggest that a significant fraction of 137Cs is not immediately immobilized by clay minerals and remains potentially mobile and bioavailable in surface layers of organic-rich soils.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Koarashi J,Nishimura S,Atarashi-Andoh M,Muto K,Matsunaga Tdoi
10.1038/s41598-019-43499-7subject
Has Abstractpub_date
2019-05-07 00:00:00pages
7034issue
1issn
2045-2322pii
10.1038/s41598-019-43499-7journal_volume
9pub_type
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