Kuster W C, Jobson B T, Karl T, Riemer D, Apel E, Goldan P D, Fehsenfeld F C
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, R/AL7, 325 Broadway, Boulder, Colorado 80305, USA.
Environ Sci Technol. 2004 Jan 1;38(1):221-8. doi: 10.1021/es034710r.
The Texas Air Quality Study 2000 (TexAQS2000) investigated the photochemical production of ozone and the chemistry of related precursors and reaction products in the vicinity of Houston, TX. The colocation of four instruments for the measurement of volatile organic carbon compounds (VOCs) allowed a unique opportunity for the intercomparison of the different in-situ measuring techniques. The instruments included three gas chromatographs, each with a different type of detector, and a Proton-Transfer-Reaction Mass Spectrometer (PTR-MS) with each system designed to measure a different suite of VOCs. Correlation plots and correlation statistics are presented for species measured by more than one of these instruments. The GC instruments were all in agreement to within 10-20% (slope) with coefficients of variation (r2) of > or = 0.85. The PTR-MS agreement with other instruments was more dependent on species with some very good agreements (r2 values of approximately 0.95 for some aromatics), but isoprene, acetaldehyde and propene were substantially less highly correlated (0.55 < r2 < 0.80). At least part of these differences were undoubtedly due to the timing of sample acquisition in an environment in which VOC levels changed very rapidly on both quantitative and temporal scales.
2000年得克萨斯空气质量研究（TexAQS2000）调查了得克萨斯州休斯顿附近臭氧的光化学生成以及相关前体和反应产物的化学性质。用于测量挥发性有机化合物（VOCs）的四种仪器的并置为不同现场测量技术的相互比较提供了独特的机会。这些仪器包括三台气相色谱仪，每台都配有不同类型的检测器，以及一台质子转移反应质谱仪（PTR-MS），每个系统设计用于测量不同的VOCs组合。给出了由这些仪器中的不止一台测量的物种的相关图和相关统计数据。气相色谱仪的测量结果在10%-20%（斜率）范围内一致，变异系数（r2）≥0.85。PTR-MS与其他仪器的一致性在更大程度上取决于物种，某些物种之间有很好的一致性（一些芳烃的r2值约为0.95），但异戊二烯、乙醛和丙烯的相关性则低得多（0.55＜r2＜0.80）。这些差异至少部分无疑是由于在一个VOC水平在数量和时间尺度上都变化非常迅速的环境中进行样品采集的时间不同所致。
