Fate of radiocesium in freshwater aquatic plants and algae in the vicinity of the Fukushima Daiichi Nuclear Power Plant

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  • 福島第一原子力発電周辺の淡水域における水中に生息する水草および藻類における放射性セシウム移行

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Abstract

The behavior of radiocesium ($^{137}$Cs) in aquatic plants (five species) and algae (three genera) that had been grown in a river (one sampling point) and ponds (four sampling points) in the area around the Fukushima Daiichi Nuclear Power Plant was investigated. The sediment-to-plant transfer factor (TF) was measured. For aquatic plants, the highest value was 5.55 for {\it P. crispus} from the river; the lowest was 3.34 $\times$ 10$^{-2}$ for {\it P. distinctus} from a pond. There were significant differences in the values for aquatic plants belonging to the same genus. The water-to-plant TF of filamentous algae ({\it Spirogyra} sp.) and cyanobacteria (coexisting {\it Anabaena} sp. and {\it Microcystis} sp.) were 2.39 $\times$ 10$^{3}$ and 1.26 $\times$ 10$^{3}$, respectively. The $^{137}$Cs concentration of cyanobacteria fraction in pond water was 4.87 $\times$ 10$^{-1}$ Bq/L, the same order of magnitude as the $^{137}$Cs concentration of pond water. Enrichment of radiocesium in cyanobacteria was not observed.

Journal

  • Limnology

    Limnology 17 (2), 111-116, 2016-04

    Tokyo : Springer Japan

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