大气中挥发性卤代烃的分析方法

根据吸附剂对挥发性有机物(VOCs)的吸附原理,结合吹扫捕集仪自行研制了VOCs气体采样管,利用VOCs气体采样管结合吹扫捕集仪与气相色谱仪联用,建立了完整的大气中VOCs的分析方法,并应用于空气中挥发性卤代烃(VHCs)的检测。结果表明,VOCs气体采样管对VHCs具有很好的吸附解吸效率,分析方法检出限为0.02⁰.1μg/m3(进样量1L),RSD在3.7%0.1μg/m3(进样量1L),RSD在3.7%⁸.7%之间,回收率92.4%8.7%之间,回收率92.4%⁹8.2%,满足痕量物质分析要求。

Analytical Methods of Volatile Halohydrocarbons in the Atmosphere

Based on the principles of Volatile Organic Compounds(VOCs) adsorption on various sorbents,an air sample tube matching up to the Purge and Trap Concentrator for VOCs was developed. Coupled with Purge and Trap Concentrator and gas chromatography(GC),a comprehensive method to determinate the VOCs in ambient air was established. The results of all experiments indicated that the method was available for trace organic matter analysis,the method detection limits(MDL) of this method is up to 0. 02-0. 1μg /m3(when the sample volume is1L) and average recoveries for the target analytes were in the range of92. 4%-98. 2%. The method also showed good linearity(R2> 0. 99) and precision(< 9%) values.