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The influence of microorganisms on technetium insolubilization in surface water on paddy field soils
https://repo.qst.go.jp/records/53221
https://repo.qst.go.jp/records/532211839a3e4-986d-4411-8620-2b51b41e9654
| Item type | 会議発表論文 / Conference Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2003-11-06 | |||||
| タイトル | ||||||
| タイトル | The influence of microorganisms on technetium insolubilization in surface water on paddy field soils | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||
| 資源タイプ | conference paper | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Ishii, Nobuyoshi
× Ishii, Nobuyoshi× Tagami, Keiko× Uchida, Shigeo× 石井 伸昌× 田上 恵子× 内田 滋夫 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Abstract Changes in physico-chemical form of Technetium (Tc) by microorganisms existing in surface waters on waterlogged soils were studied. The surface waters contacting with air were incubated with 95mTcO4- at 25˚C for 4 to 5 days. After the incubation, the samples were sequentially separated into four fractions: one insoluble fraction (> 0.2 µm) and three soluble fractions (TcO4-, cation forms, and the other forms). Relative radioactivity of 95mTcO4- in each fraction was measured with a NaI (TI) scintillation counter. The added 95mTcO4- insolubilized in the surface waters. The maximum insolubilization of 37% was found in a soil sample, P38, which was collected from a paddy field. For the other samples, less than 12% of Tc was changed to insoluble Tc. Specific microorganisms having the ability to insolubilize Tc seemed to exist in the P38 sample. The addition of nutrients to the P38 resulted in the increase of insoluble Tc up to 77%, while both treatments of filtration and autoclaving caused the decrease of that to less than 2%. The filtered and the autoclaved sample contained metabolite of microorganisms and dead microbial cell particles, respectively. These materials, therefore, did not affect on physico-chemical changes in Tc form. Dominant microorganisms in the sample were bacteria. However, bacterial abundance did not related with the insolubilization ratios. These results show that living and specific bacteria directly contribute to the insolubilization of TcO4- even under aerobic conditions. |
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| 書誌情報 |
Proceedings of International Symposium on Bio-Trace Elements 巻 2002, p. 149-151, 発行日 2002-11 |
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