【摘要】 [目的]按照GB50325-2001附录E要求,建立空气中挥发性有机物热脱附-气相色谱联用技术测定方法。[方法]采用Tenax-TA吸附管吸附空气中挥发性有机物,经热脱附二级解吸进入气相色谱仪检测。[结果]本研究方法测定空气中挥发性有机物线形范围0.02~5.0μg,最低检出限0.002mg/m(3采样体积10L计),回收率78%~92%,相对标准偏差2.4%~7.8%。[结论]本研究所建立的空气中总挥发性有机物热脱附-气相色谱联用技术测定方法灵敏度高、操作简便、重现性好、准确可靠,适合环境空气中挥发性有机物的测定。更多还原

【Abstract】 [ Objective] According to the requirement of the appendix E in GB50325-2001,to develop a method for detecting volatile organic compounds in air using thermal desorption/gas chromatography.[ Methods] Volatile organic compounds in air were adsorbed by Tenax-TA thermal desorption tubes,and these compounds were detected by second-step thermal desorption/gas chromatography.[ Results] The linear range of the results using this method is 0.02~5.0μg,the limit of detection is 0.002mg/m3,and the recovery is 78%~92%,with the relative standard deviation of 2.4%~7.8%.[ Conclusion] A method has been established for the detection of volatile organic compounds in air by thermal desorption/gas chromatography. The method is sensitive,simple,reproducibility,accurate and applicable to the characterization of environments containing mixtures of volatile organic compounds.更多还原