Radiocesium leaching from contaminated litter in forest streams

Journal of Environmental Radioactivity
Masaru SakaiKaori Murase

Abstract

In Japanese forests suffering from the Fukushima Daiichi Nuclear Power Plant accident, litter fall provides a large amount of radiocesium from forests to streams. Submerged litter is processed to become a vital food resource for various stream organisms through initial leaching and subsequent decomposition. Although leaching from litter can detach radiocesium similarly to potassium, radiocesium leaching and its migration are poorly understood. We examined both radiocesium and potassium leaching to the water column and radiocesium allocation to minerals (glass beads, silica sand, and vermiculite) in the laboratory using soaked litter with and without minerals on a water column. The mineral types did not affect radiocesium leaching from litter, but soaking in water for 1, 7, and 30 days decreased the radiocesium concentration in litter by ×0.71, ×0.66, and ×0.56, respectively. Meanwhile, the 1-, 7-, and 30-day experiments decreased potassium concentration in litter by ×0.17, ×0.11, and ×0.09, respectively. Leached radiocesium remained in a dissolved form when there was no mineral phases present in the water, whereas there was sorption onto the minerals when they were present. In particular, vermiculite adsorbed radiocesium by two...Continue Reading

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Citations

Jan 21, 2016·The Science of the Total Environment·Adrian H Gallardo, Atsunao Marui
Dec 3, 2015·Environmental Pollution·Masaru SakaiKengo Okada
Aug 2, 2016·Journal of Environmental Radioactivity·Masaru SakaiJunjiro N Negishi
Apr 29, 2018·Scientific Reports·Nobuyoshi IshiiNobuhito Ohte
May 1, 2020·Archives of Environmental Contamination and Toxicology·Hirokazu OzakiIzumi Watanabe
Jul 31, 2021·The Science of the Total Environment·Koichi SakakibaraYuichi Onda
Mar 17, 2019·Journal of Environmental Radioactivity·Mengistu T TeramageFrederic Coppin

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