Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 223, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2020.106417
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Funding
- JSPS KAKENHI [18H04141]
- Grants-in-Aid for Scientific Research [18H04141] Funding Source: KAKEN
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Cesium is an element that belongs to the same group as K, and is known to show similar behaviour to that of K in plants. In this study, we conducted a serial leaching test for 120 h to compare the leaching characteristics of dissolved Cs-137 and K in forest litter, obtained from Japanese cedar and deciduous broadleaf forests located 40 km from the site of the 2011 Fukushima Dai-ichi nuclear power plant accident. The litter was collected in 2018 and was divided into three groups according to the decomposition level. The cumulative leachable fraction of Cs-137 at 120 h ranged from 0.3% to 3.3%, suggesting that most of the Cs-137 in the litter was hardly leachable in water. The leachable fraction of Cs-137 generally decreased with the decomposition level of the litter, implying that the easily leachable Cs-137 eluted into the water during the first stage of decomposition. Meanwhile, the cumulative leachable fraction of K at 120 h was approximately 10 times greater than that of Cs-137 and ranged from 22.7% to 54.8%. The leaching speeds of Cs-137 and K decreased suddenly with elapsed time regardless of the tree species, decomposition degree, or element. Our findings contribute to the long-term understanding of the Cs-137 cycle in forest ecosystems.
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