智能双检测器气相色谱分析仪用于挥发性有机物(VOC)连续监测
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摘要
快速的城市化和经济发展导致了诸如挥发性有机物(VOCs)这样的空气污染。准确、连续地监测环境空气和室内空气中的VOCs,对于提高人们对暴露于环境中的有毒物质的认识,从而提高人们的安全是至关重要的。为了提供这种能力,介绍了一种专门用于监测C2至C6组分的、配备了质谱检测器和火焰离子检测器的全自动热脱附气相色谱仪(auto-TDGC-MS-FID)。首先,该系统的性能已经在至少100种不同的组分进行了研究,随后,该方法也应用于对自动内校准的稳定性的研究。结果表明,与传统的GC-FID配置相比,这种智能架构的性能得到了增强:良好的线性和精确至ppt级的定量。这两种检测器的组合可以测量100%的目标组分,其精度值表示为相应标准的10%或5%以内。此外,通过两种检测器的相互对比验证了结果。
Rapid urbanization and economic development lead to air pollution problems such as Volatile Organic Compounds(VOCs). Accurate and continuous monitoring and quantification of VOCs in ambient and indoor air is critical to improve the understanding of the exposure to toxicants released into the environment, and hence improve people's safety. To provide such capabilities, this paper presents an automated Thermal-Desorber Gas Chromatograph dedicated to the monitoring of C2 to C6 molecules equipped with both Mass Spectrometry and Flame Ionization Detectors(auto-TDGC-MS-FID). The performance of the system has been studied on almost 100 molecules. Then, the stability of the automatic internal calibration was studied. In comparison with conventional GC-FID configurations this smart architecture shows excellent linearity of the response and precise quantification down to ppt levels. The combination of these two detectors allows measuring 100% of the targeted compounds with precision values expressed as a relative standard of < 10% or < 5%. In addition, results are validated by the intercomparison of both detectors.
Rapid urbanization and economic development lead to air pollution problems such as Volatile Organic Compounds(VOCs). Accurate and continuous monitoring and quantification of VOCs in ambient and indoor air is critical to improve the understanding of the exposure to toxicants released into the environment, and hence improve people's safety. To provide such capabilities, this paper presents an automated Thermal-Desorber Gas Chromatograph dedicated to the monitoring of C2 to C6 molecules equipped with both Mass Spectrometry and Flame Ionization Detectors(auto-TDGC-MS-FID). The performance of the system has been studied on almost 100 molecules. Then, the stability of the automatic internal calibration was studied. In comparison with conventional GC-FID configurations this smart architecture shows excellent linearity of the response and precise quantification down to ppt levels. The combination of these two detectors allows measuring 100% of the targeted compounds with precision values expressed as a relative standard of < 10% or < 5%. In addition, results are validated by the intercomparison of both detectors.
引文
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[2]Cakmak,S.,Dales,R.E.,Liu,L.,Kauri,L.M.Lemieux,C.L.,Hebbern,C.,Zhu,J.,2014Residential exposure to volatile organic compounds and lung function:Results from a population-based cross-sectional survey.Environ Pollut.194,145-151.
[3]Chen,C.,Driggs Campbell,K.,Negi,I.,Iglesias,R.A.,Owens,P.,Tao,N.,Tsow,F.,Forzani,E.S.,2012.A new sensor for the assessment of personal exposure to volatile organic compounds.Atmos.Environ.54,679-687.
[4]Guo,H.,So,K.L.,Simpson,I.J.,Barletta,B.Meinardi,S.,Blake,D.R.,2007.C1-C8 volatile organic compounds in the atmosphere of Hong Kong:Overview of atmospheric processing and source apportionment.Atmos.Environ41,1456-1472.
[5]Helmig,D.,1999.Air analysis by gas chromatography.J.Chromatogr.A 843,129-146.
[6]Jian,R.-S.,Sung,L.-Y.,Lu,C.-J.,2014.Measuring real-time concentration trends of individual VOC in an elementary school using a sub-ppb detectionμGC and a single GC-MSanalysis.Chemosphere 99,261-266.