Automatic on-line monitoring of atmospheric volatile organic compounds: Gas chromatography-mass spectrometry and gas chromatography-flame ionization detection as complementary systems

被引:39
|
作者
de Blas, Maite [1 ]
Navazo, Marino [2 ]
Alonso, Lucio [2 ]
Durana, Nieves [2 ]
Iza, Jon [3 ]
机构
[1] Univ Basque Country, Univ Coll Tech Min & Civil Engn, Chem & Environm Engn Dept, Baracaldo 48902, Spain
[2] Univ Basque Country, Chem & Environm Engn Dept, Sch Engn, Bilbao 48013, Spain
[3] Univ Basque Country, Fac Pharm, Chem & Environm Engn Dept, Vitoria 01006, Spain
关键词
Volatile organic compound (VOC); Gas chromatography mass spectrometry; (GC MS); Gas chromatography flame ionization; detection (GC-FID); Retention Index; On-line monitoring; Air quality; AMBIENT AIR; NONMETHANE HYDROCARBONS; THERMAL-DESORPTION; OZONE PRECURSORS; URBAN; VOC; KAOHSIUNG; TRENDS;
D O I
10.1016/j.scitotenv.2011.08.072
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Traditionally air quality networks have been carrying out the continuous, on-line measurement of volatile organic compounds (VOC) in ambient air with GC-FID. In this paper some identification and coelution problems observed while using this technique in long-term measurement campaigns are described. In order to solve these problems a GC-MS was set up and operated simultaneously with a GC-FID for C-2-C-11 VOCs measurement. There are few on-line, unattended, long term measurements of atmospheric VOCs performed with GC-MS. In this work such a system has been optimized for that purpose, achieving good repeatability, linearity, and detection limits of the order of the GC-FID ones, even smaller in some cases. VOC quantification has been made by using response factors, which is not frequent in on-line GC-MS. That way, the identification and coelution problems detected in the GC-FID, which may led to reporting erroneous data, could be corrected. The combination of GC-FID and GC-MS as complementary techniques for the measurement of speciated VOCs in ambient air at sub-ppbv levels is proposed. Some results of the measurements are presented, including concentration values for some compounds not found until now on public ambient air VOC databases, which were identified and quantified combining both techniques. Results may also help to correct previously published VOC data with wrongly identified compounds by reprocessing raw chromatographic data. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:5459 / 5469
页数:11
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