The levels, sources and reactivity of volatile organic compounds in a typical urban area of Northeast China
The levels, sources and reactivity of volatile organic compounds in a typical urban area of Northeast China
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东北典型城区挥发性有机物含量、来源及反应性
DOI：
10.1016/j.jes.2018.11.015
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发表时间：
2019
影响因子：
6.9
通讯作者：
Mu Yujing
中科院分区：
文献类型：
--
作者：
Ma Zhuobiao;Liu Chengtang;Zhang Chenglong;Liu Pengfei;Ye Can;Xue Chaoyang;Zhao Di;Sun Jichen;Du Yiming;Chai Fahe;Mu Yujing
2017年8月20日至9月16日，沉阳某监测点连续测量空气中挥发性有机化合物（VOCs）浓度。烷烃、烯烃、芳烃和羰基化合物的平均浓度分别为28.54、6.30、5.59和9.78 ppbv。根据VOCs和CO的测量数据，通过正矩阵分解模型识别出7个来源。汽车尾气占测量VOCs总丙烯当量浓度的比例最大（36.15%），其次是燃烧排放（16.92%）、植被排放和二次生成（14.33%）、溶剂使用（10.59%）、石化工业排放。 （9.89%）、汽油蒸发（6.28%）和液化石油气（LPG）使用（5.84%）。汽车尾气、溶剂使用和燃烧排放是 O3 形成潜力的前三位 VOC 来源，分别占 34.52%、16.55% 和 11.94%。每个来源的挥发性有机化合物总量的日变化可以通过其排放特征得到很好的解释，例如，液化石油气使用中挥发性有机化合物浓度的两个峰值与早餐和午餐的烹饪时间一致。每个来源的 VOC 的风玫瑰图可以揭示监测点周围来源的可能分布。测量期间的O3污染事件与VOCs的升高是一致的，这主要是由于来自东南方向的大气团造成的，其中石化工业排放占主导地位，这表明东南方向的石化工业排放可能是沉阳市O3污染的一个重要原因。
Air concentrations of volatile organic compounds (VOCs) were continually measured at a monitoring site in Shenyang from 20 August to 16 September 2017. The average concentrations of alkanes, alkenes, aromatics and carbonyls were 28.54, 6.30, 5.59 and 9.78 ppbv, respectively. Seven sources were identified by the Positive Matrix Factorization model based on the measurement data of VOCs and CO. Vehicle exhaust contributed the most (36.15%) to the total propene-equivalent concentration of the measured VOCs, followed by combustion emission (16.92%), vegetation emission and secondary formation (14.33%), solvent usage (10.59%), petrochemical industry emission (9.89%), petrol evaporation (6.28%), and liquefied petroleum gas (LPG) usage (5.84%). Vehicle exhaust, solvent usage and combustion emission were found to be the top three VOC sources for O3formation potential, accounting for 34.52%, 16.55% and 11.94%, respectively. The diurnal variation of the total VOCs from each source could be well explained by their emission characteristics, e.g., the two peaks of VOC concentrations from LPG usage were in line with the cooking times for breakfast and lunch. Wind rose plots of the VOCs from each source could reveal the possible distribution of the sources around the monitoring site. The O3pollution episodes during the measurement period were found to be coincident with the elevation of VOCs, which was mainly due to the air parcel from the southeast direction where petrochemical industry emission was found to be dominant, suggesting that the petrochemical industry emission from the southeast was probably a significant cause of O3pollution in Shenyang.