Durana Nieves, Navazo Marino, Alonso Luclo, García José A, Ilardia Juan L, Gómez M Carmen, Gangoiti Gotzon
Department of Chemical and Environmental Engineering, School of Engineering, University of the Basque Country, Bilbao, Spain.
J Air Waste Manag Assoc. 2002 Oct;52(10):1176-85. doi: 10.1080/10473289.2002.10470857.
This paper presents results of the processing and validation of data collected by an automatic gas chromatograph (AGC). This system was used to monitor 62 volatile organic compounds (VOCs) in urban air in the Basque Country, Spain. The nonpolar compounds (C2-C10) identified-paraffins, olefins, aromatics, and chlorinated compounds-accounted for 88% of the mass of total non-methane hydrocarbons (TNMHCs) in ambient air. The evaluation of linearity, precision, detection limits (DLs), and stability of retention times (RTs) indicates that the equipment is suitable for measuring ambient air automatically for prolonged periods (6 months). The calibration of the equipment using response factors calculated on the basis of the effective carbon number (ECN) showed variations of over 10% for acetylene, isoprene, and n-hexane. The results provided by the automatic chromatograph correlated significantly with simultaneous results from other widely used techniques for determining VOCs in ambient air: (1) portable GC, equipped with photoionization detector (PID), and (2) active adsorption on Tenax-TA followed by thermal desorption and chromatographic analysis.
本文介绍了由自动气相色谱仪（AGC）收集的数据的处理和验证结果。该系统用于监测西班牙巴斯克地区城市空气中的62种挥发性有机化合物（VOC）。所识别出的非极性化合物（C2 - C10）——石蜡、烯烃、芳烃和氯化化合物——占环境空气中总非甲烷烃（TNMHC）质量的88%。对线性、精密度、检测限（DL）和保留时间（RT）稳定性的评估表明，该设备适用于长时间（6个月）自动测量环境空气。使用基于有效碳数（ECN）计算的响应因子对设备进行校准，结果显示乙炔、异戊二烯和正己烷的变化超过10%。自动色谱仪提供的结果与其他广泛用于测定环境空气中VOC的技术的同步结果显著相关：（1）配备光离子化检测器（PID）的便携式气相色谱仪，以及（2）在Tenax - TA上进行主动吸附，然后进行热脱附和色谱分析。
