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Trace determination of uranium preconcentrated using graphene oxide by total reflection X-ray fluorescence spectrometry
https://repo.qst.go.jp/records/74821
https://repo.qst.go.jp/records/7482144243b88-23af-4762-8b82-29d5ce557427
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-03-19 | |||||
| タイトル | ||||||
| タイトル | Trace determination of uranium preconcentrated using graphene oxide by total reflection X-ray fluorescence spectrometry | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| 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 |
Takahashi, Hiroaki
× Takahashi, Hiroaki× Izumoto, Yukie× Matsuyama, Tsugufumi× Yoshii, Hiroshi× Izumoto, Yukie× Matsuyama, Tsugufumi× Yoshii, Hiroshi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The leaching of actinides from the fuel debris that has arisen from the severe accident at the Fukushima Daiichi Nuclear Power Station (1F NPS) was inferred from leaching experimentso f simulated fuel debris into seawater [1]. The leaching ratios from the simulated fuel debris were reported in the order corresponding to U > Np ≈ Am ≈ Pu [1]. For the radiological characterisation of contaminated material and waste from the 1F NPS, it is quite important to measure the concentration of actinides, especially uranium with a high leaching ratio. Since uranium has lower α specific radioactivity than the other actinides, it is difficult to detect uranium dissolved in water by α counting. As the total reflection X-ray fluorescence (TXRF) spectrometry is useful for the determination of uranium, we studied a fast and simple analytical method of trace determination of uranium in a multi-element solution which contains 4 ng mL-1 each of 6 elements: Co, Cs, Cu, Th, U and Rb. The method was based on TXRF and dispersive micro-solid phase extraction (DMSPE) using graphene oxide (GO) as a solid adsorbent whose maximum uranium adsorption capacities were higher than any of the reported nanomaterials [2, 3]. In this method, the suspension of GO was injected into a multi-element solution to adsorb uranium. After the adsorption period, uranium adsorbed on the GO nanosheets was separated from the solution by vacuum filtration and soaked to elute in a small volume of internal standard solution of 2 mol L-1 HNO3 mixing with indium internal standard. The 10 μL of the eluents was deposited onto a glass reflector and dried over 5 min, and their TXRF spectra were measured for 5 min. Since rubidium was effectively removed from the uranium-containing solution by the DMSPEGO method, the interference of Rb Kα peak against U Lα peak was avoided in the TXRF spectrometry. The recovery efficiencies of uranium from a dilute multi-element solution by the GO were high, however, they slightly decreased with increasing of the ion strength from 0 to 1 mol L-1. Our findings demonstrate that the TXRF spectrometry followed by preconcentration and Rb removal by DMSPE using GO could be used as a fast and simple analytical method for trace determination of uranium concentration in contaminated water. [1] A. Kirishima, M. Hirano, T. Sasaki, N. Sato, J. Nucl. Sci. Technol. 52(10), 2015, 1240-1246. [2] Z. J. Li, F. Chen, L. Y. Yuan, Y. L. Liu, Y. L. Zhao, Z. F. Chai, W. Q. Shi, Chem. Eng. J., 210, 2012, 539−546. [3] G. X. Zhao, T. Wen, X. Yang, S. B. Yang, J. L. Liao, J. Hu, D. D. Shao, X. K. Wang, Dalton Trans. 41 (20), 2012, 6182−6188. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | European Conference on X-ray Spectrometry (EXRS2018) | |||||
| 発表年月日 | ||||||
| 日付 | 2019-03-28 | |||||
| 日付タイプ | Issued | |||||
