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

樹体内への放射性セシウムの取り込み及び転流メカニズムの理解のためのセシウム化学状態解析

田中 万也; 金指 努*; 竹中 千里*; 高橋 嘉夫*

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

本研究では、安定セシウムを樹皮,辺材,心材,樹葉,枝に吸着させてEXAFSスペクトル測定を行った。その結果、すべての部位においてセシウムは外圏型錯体として静電的に吸着していることが明らかとなった。これは酢酸アンモニウムを用いたセシウム脱離実験の結果と整合的であった。また、これらの結果は、常緑樹であるスギ,アカマツと落葉広葉樹であるコナラ,コシアブラのすべての樹種において同様であった。

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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