Validation of atmospheric VOC measurements by proton-transfer-reaction mass spectrometry using a gas-chromatographic preseparation method

被引:223
作者
Warneke, C
De Gouw, JA
Kuster, WC
Goldan, PD
Fall, R
机构
[1] Natl Ocean & Atmospher Adm, Aeron Lab, Boulder, CO 80305 USA
[2] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA
[3] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
关键词
D O I
10.1021/es026266i
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Proton-transfer-reaction mass spectrometry (PTR-MS) has emerged as a useful tool to study volatile organic compounds (VOCs) in the atmosphere. In PTR-MS, proton-transfer reactions with H3O+ ions are used to ionize and measure VOCs in air with a high sensitivity and fast time response. Only the masses of the ionized VOCs and their fragments, if any, are determined, and these product ions-are not unique indicators of VOC identities. Here, a combination of gas chromatography and PTR-MS (GC-PTR-MS) is used to validate the measurements by PTR-MS of a number of common atmospheric VOCs. We have analyzed 75 VOCs contained in standard mixtures by GC-PTR-MS, which allowed detected masses to be unambiguously related to a specific compound. The calibration factors for PTR-MS and GC-PTR-MS were compared and showed that the loss of VOCs in the sample acquisition and GC system is small. GC-PTR-MS analyses of 56 air samples from an urban site were used to address the specificity of PTR-MS in complex air masses. It is demonstrated that the ions associated with methanol, acetonitrile, acetaldehyde, acetone, benzene, toluene, and higher aromatic VOCs are free from significant interference. A quantitative intercomparison between PTR-MS and GC-PTR-MS measurements of the aforementioned VOCs was performed and shows that they are accurately measured by PTR-MS.
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页码:2494 / 2501
页数:8
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