Oxygenated volatile organic compounds (OVOCs) at an urban background site in Zurich (Europe):: Seasonal variation and source allocation
Oxygenated volatile organic compounds (OVOCs) at an urban background site in Zurich (Europe):: Seasonal variation and source allocation
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DOI：
10.1016/j.atmosenv.2007.07.026
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发表时间：
2007-12-01
影响因子：
5
通讯作者：
Reimann, Stefan
中科院分区：
文献类型：
--
作者：
Legreid, Geir;Loeoev, Jacob Balzani;Reimann, Stefan
21氧化挥发性有机化合物（OVOCs）进行了测量，在四个季节的运动在城市背景站点在苏黎世（瑞士）与一个新开发的双吸附采样单元耦合到气相色谱-质谱仪（GC-MS）。此外，在夏季和冬季活动中，还测量了选定的非甲烷碳氢化合物（NMHCs）以及甲醛。在所有季节中测得的最丰富的化合物是乙醇，峰值超过60 ppb。夏季平均值低于冬季的季节性变化表明主要是人为源。与此相反，与其他生物源的化合物，或已知的化合物产生的对流层氧化过程中，在夏季有季节性的最大值（例如，甲醇，丙酮，甲醛，甲基丙烯醛和2-丁烯酮（甲基乙烯基酮，MVK））。对于OVOCs，估计本地源的混合比例的40%和49%，分别在夏季和冬季的测量化合物。据估计，燃烧对这些当地来源的贡献率为75%，与季节无关。苏黎世约50%的OVOC和NMHC水平可以解释为区域背景，其中包括区域生物和人为来源，除了二次生产。确定了丙酮、丁酮（甲乙酮）、正丙醇、异丙醇、正丁醇、乙酸乙酯和乙酸丁酯的工业来源。(c)2007爱思唯尔有限公司保留所有权利。
Twenty-one oxygenated volatile organic compounds (OVOCs) were measured in four seasonal campaigns at an urban background site in Zurich (Switzerland) with a newly developed double adsorbent sampling unit coupled to a gas chromatograph-mass spectrometer (GC-MS). In addition, selected non-methane hydrocarbons (NMHCs) were measured, as well as formaldehyde in the summer and winter campaign. The most abundant compound measured in all seasons was ethanol, with peak values of more than 60 ppb. Its seasonal variation with a lower mean value in summer compared to that in winter implied mostly anthropogenic sources. In contrast, compounds with additional biogenic sources, or compounds known to be produced in the troposphere by oxidation processes, had seasonal maxima in summer (e.g. methanol, acetone, formaldehyde, methacrolein and 2-butenone (methyl vinyl ketone, MVK)).For the OVOCs it was estimated that local sources contributed 40% and 49% to the mixing ratios of the measured compounds in summer and in winter, respectively. Combustion was estimated to contribute 75% to these local sources independent of the season. About 50% of both the OVOC and NMHC levels in Zurich could be explained by the regional background, which included regional biogenic and anthropogenic sources in addition to secondary production. Industrial sources were identified for acetone, butanone (methyl ethyl ketone, MEK), n-propanol, iso-propanol, n-butanol, ethyl acetate and butyl acetate. (c) 2007 Elsevier Ltd. All rights reserved.