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Speciation of cesium in tree tissues and its implication for uptake and translocation of radiocesium in tree bodies

Tanaka, Kazuya ; Kanasashi, Tsutomu*; Takenaka, Chisato*; Takahashi, Yoshio*

In this study, we investigated coordination structures of Cs in $$^{133}$$Cs-doped bark, sapwood, heartwood, needle, and branch samples of trees collected in Fukushima by extended X-ray absorption fine structure (EXAFS) spectroscopy. We examined four representative tree species in Fukushima, ${it Cryptomeria japonica}$, ${it Pinus densiflora}$, ${it Quercus serrata}$, and ${it Eleutherococcus sciadophylloides}$. EXAFS spectra suggested that Cs was adsorbed as an outer-sphere complex on all parts of the four species, with electrostatic binding to negatively charged functional groups in components of tree tissues. These results were supported by extraction experiments where most of the sorbed Cs was desorbed from all parts of each tree species using 1 M CH$$_{3}$$COONH$$_{4}$$.

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Category:Environmental Sciences

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