| Progress in neutron activation analysis for uranium |
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| 作者姓名： | 杜鸿善 李贵群 董桂芝 李俊兰 K.H.Chiu C.M.Wai |
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| 作者单位： | China Institute of Atomic Energy，Beijing 102413，China，China Institute of Atomic Energy，Beijing 102413，China，China Institute of Atomic Energy，Beijing 102413，China，China Institute of Atomic Energy，Beijing 102413，China，Department of Chemistry，University of Idaho，USA，Department of Chemistry，University of Idaho，USA |
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| 摘 要： | A new type of extractant, sym-dibenzo-16-crown-5-oxyhydroxamic acid (HL) is introduced. The extractions of UO22+, Na+, K+, Sr2+, Ba2+ and Br- were studied with HL in chloroform. The results obtained show that UO22+ can be quantitatively extracted at pH values above 5, whereas the extractions of K+, Na+, Sr2+, Ba2+ and Br- are negligible in the pH range of 2 - 7. The dependence of the distribution ratio of U(VI) on both the concentration of the HL and pH are linear, and they have the same slope of 2. This suggests that U(VI) appears to form a 1:2 complex with ligand. Uranium(VI) can be selectively separated and concentrated from interfering elements such as Na, K, Sr and Br by solvent extraction with HL under specific conditions. The recovery of uranium is nearly 100% and the radionudear purity of uranium is greater than 99.99%. Therefore, neutron activation analysis has greatly improved the sensitivity and accuracy for the detection of trace uranium from seawater.
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Progress in neutron activation analysis for uranium |
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| DU Hongshan,LI Guiqun DONG GuizhiLI Junlan.Progress in neutron activation analysis for uranium[J].Science in China(Chemistry),1996(2). |
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| Authors: | DU Hongshan LI Guiqun DONG GuizhiLI Junlan |
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| Abstract: | A new type of extractant, sym-dibenzo-16-crown-5-oxyhydroxamic acid (HL) is introduced. The extractions of UO22+, Na+, K+, Sr2+, Ba2+ and Br- were studied with HL in chloroform. The results obtained show that UO22+ can be quantitatively extracted at pH values above 5, whereas the extractions of K+, Na+, Sr2+, Ba2+ and Br- are negligible in the pH range of 2 - 7. The dependence of the distribution ratio of U(VI) on both the concentration of the HL and pH are linear, and they have the same slope of 2. This suggests that U(VI) appears to form a 1:2 complex with ligand. Uranium(VI) can be selectively separated and concentrated from interfering elements such as Na, K, Sr and Br by solvent extraction with HL under specific conditions. The recovery of uranium is nearly 100% and the radionudear purity of uranium is greater than 99.99%. Therefore, neutron activation analysis has greatly improved the sensitivity and accuracy for the detection of trace uranium from seawater. |
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| Keywords: | uranium preconcentration neutron activation analysis |
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