Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection  

从环境样品中分离氩气和氪气用于放射性惰性气体探测

作　　者：涂乐义[1] 杨国民[1] 张向阳[1,2] 胡水明[1] 

机构地区：[1]中国科学技术大学合肥微尺度物质国家实验室筹,合肥230026 [2]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《Chinese Journal of Chemical Physics》2016年第1期151-156,I0003,共7页化学物理学报（英文）

基　　金：This work was supported by the Special Fund for Land and Resources Research in the Public Interest （No.201511046） and the National Natural Science Foundation of China （No.21225314 and No.41102151）. We would like to give our gratitude to Zong-yu Chen from IHEG for organizing the field campaign.

摘　　要：Radioactive noble-gas isotopes, SSKr （half-life tl/2=10.8 y）, 39Ar （tl/2=269 y）, and SlKr （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.

关 键 词：Atom trap trace analysis Gas chromatography Radioactive noble gas 

分 类 号：O[理学]