Absorption properties of the Cs in the bark of Cryptomeria japonica and Quercus serrata

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  • Iwase Kaori
    Graduate School of Bioagricultural Sciences, Nagoya University:(Present office)Sumitomo Forestry Co., Ltd.
  • Tomioka Rie
    Graduate School of Bioagricultural Sciences, Nagoya University
  • Sugiura Yuuki
    Graduate School of Bioagricultural Sciences, Nagoya University
  • Kanasashi Tutomu
    Graduate School of Bioagricultural Sciences, Nagoya University
  • Takenaka Chisato
    Graduate School of Bioagricultural Sciences, Nagoya University

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Other Title
  • スギとコナラ樹皮におけるセシウム吸着特性について
  • スギ ト コナラ ジュヒ ニ オケル セシウム キュウチャク トクセイ ニ ツイテ

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Abstract

To clarify the mobility of radiocesium (^<137>Cs) deposited in tree bark, we investigated the absorption properties of the Cs in the bark as the first step, using stable isotope (cold) ^<133>Cs. We compared absorption/desorption properties of ^<133>Cs with alkali metals, sodium (Na), potassium (K), and rubidium (Rb), in the bark of sugi (Cryptomeria japonica) and konara (Quercus serrata), which distribute a lot in Fukushima. Each alkali metal ion was absorbed to grinded bark by shaking with the 1 mol m^<-3> chloride solution of each alkali metal. Then, each alkali metal absorbed on the grinded bark was continuously extracted using 1 mol m^<-3> acetic acid ammonium (CH_3COONH_4) and 1 mol m^<-3> nitric acid (HNO_3) solution. In both tree species, Na^+ and K^+ were extracted almost same as or slightly more than absorbed amount in the bark. On the other hand, ^<133>Cs^+ and Rb^+ were extracted 57.6% and 38.3% in bark of sugi and 20.6% and 30.2% in bark of konara, respectively, therefore, most of absorbed ^<133>Cs^+ and Rb^+ seemed to be strongly fixed/absorbed in the bark. ^<137>Cs was extracted from the konara bark which was collected at Fukushima prefecture using the same procedure as above. As the result, ^<137>Cs extractability in konara bark was very low with 0.1 to 0.4%, except the sample after extraction by CH_3COONH_4 in the bark collected in Iwaki city. In this study, it was clarified that Cs fixed/absorbed in the tree bark is not easily removed.

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