| 从环境样品中分离氩气和氪气用于放射性惰性气体探测 |
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| 引用本文： | 涂乐义,杨国民,张向阳,胡水明.从环境样品中分离氩气和氪气用于放射性惰性气体探测[J].化学物理学报,2016,29(1):151-156. |
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| 作者姓名： | 涂乐义 杨国民 张向阳 胡水明 |
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| 作者单位： | 中国科学技术大学合肥微尺度物质国家实验室, 合肥 230026,中国科学技术大学合肥微尺度物质国家实验室, 合肥 230026,中国科学技术大学合肥微尺度物质国家实验室, 合肥 230026;中国地质科学院水文地质环境地质研究所, 石家庄 050061,中国科学技术大学合肥微尺度物质国家实验室, 合肥 230026 |
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| 摘 要： | 放射性惰性气体同位素85Kr(半衰期为10.8年)、39Ar(半衰期为269年)和81Kr(半衰期为22.9万年)是理想的环境示踪剂,基于激光技术的原子阱痕量分析方法(Atom trap trace analysis, ATTA)可以实现对空气、地下水等环境样品中这几种同位素的有效探测. 在进行ATTA测量之前,需要将样品中的氪气和氩气有效分离出来. 利用低温蒸馏、海绵钛化学吸附和气相色谱分离等技术,可以从1~10 L气体样品中分别提取出90%以上的氪气和98%以上的氩气,从而满足ATTA测量的样品要求. 通过对包括两个野外地下水样品等一系列样品进行分离实验,验证了气体分离装置的可靠性能.
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| 关 键 词： | 原子阱痕量分析 气相色谱分离 放射性惰性气体 |
| 收稿时间： | 2015/10/9 0:00:00 |
| 修稿时间： | 2015/12/24 0:00:00 |
Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection |
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| Le-yi Tu,Guo-min Yang,Xiang-yang Zhang and Shui-ming Hu.Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection[J].Chinese Journal of Chemical Physics,2016,29(1):151-156. |
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| Authors: | Le-yi Tu Guo-min Yang Xiang-yang Zhang and Shui-ming Hu |
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| Institution: | Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China,Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China,Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China;Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding 050803, China and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Radioactive noble-gas isotopes, 85Kr (half-life t1/2=10.8 y), 39Ar (t1/2=269 y), and 81Kr (t1/2=229,000 y), are ideal tracers and can be detected by atom trap trace analysis (ATTA), a laser-based technique, from environmental samples like air and groundwater. Prior to ATTA measurements, it is necessary to efficiently extract krypton and argon gases from samples. Using a combination of cryogenic distillation, titanium chemical reaction and gas chromatography, we demonstrate that we can recover both krypton and argon gases from 1-10 L "air-like" samples with yields in excess of 90% and 98%, respectively, which meet well the requirements for ATTA measurements. A group of testing samples are analyzed to verify the performance of the system, including two groundwater samples obtained from north China plain. |
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| Keywords: | Atom trap trace analysis Gas chromatography Radioactive noble gas |
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