卤代烷烃高灵敏度示踪气体筛选  

Study on screening high sensitivity tracer gas from halogenated hydrocarbons

作　　者：田梅[1] 袁圆[1] 郑军芳[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《分析试验室》2016年第11期1343-1347,共5页Chinese Journal of Analysis Laboratory

摘　　要：确定了备选示踪气体CF4,C2F6,CF3Br,CF2Cl Br,对比了它们的色谱分析性能,结合大气本底水平,筛选出CF3Br和CF2Cl Br可作为高灵敏度示踪气体。这两种气体物化性质稳定,室外大气本底分别为(4.3±1.1)×10-12(V/V),(2.1±0.5)×10-12(V/V),500μL进样量情况下方法的最小检测量分别为4×10-12(V/V),2×10-12(V/V),满足高灵敏度示踪和快速监测的需求。Although SF6 is currently used as the most excellent high sensitivity tracer gas, it is still necessary to screen other high sensitivity tracer gas for dual or multi-element high sensitivity tracing in some cases. In this study, four kinds of halogenated hydrocarbons were selected as the screening objects according to their physical- chemical properties, low atmospheric background, feasibility of simple-rapid test and potential analysis sensitivity. The 4 halogenated hydrocarbonsare CF4, C2 F6, CF3 Br and CF2 C1Br, which should have high sensitivity to GC-ECD in theory. Experiment results showed that CF3 Br and CF2 C1Br can serve as high sensitivity tracer gases, but CF4 and CaF6 are not suitable high sensitivity tracer gas due to their irresponsiveness to micro- cell electrical capture detector（tx-ECD）. Gas chroma were developed. Under the optimized conditions, the tographic methods for the analysis of CF3 Br and CF2 C1Br minimum detectable concentration of CF3 Br and CF2 C1Br were 4.0 × 10-12（V/V） and 2.0 × 10-12（V/V） respectively atsample volumeof 500 μL. The background of CF3 Br and CF2C1Br were measured to be 4.3 ±1.1 ×10 -12 （V/V） and 2. 1 ±0. 5 × 10 -12 （V/V） with the standard addition method.

关 键 词：卤代烷烃 示踪气体 二氟一氯一溴甲烷 三氟溴甲烷 

分 类 号：X830.2[环境科学与工程—环境工程]