| 沈阳市大气挥发性有机物（VOCs）污染特征 |
| 摘要点击 8036 全文点击 5195 投稿时间：2010-10-28 修订日期：2010-12-23 |
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| 中文关键词 挥发性有机物 沈阳 季节分布 日变化 空间分布 来源识别 |
| 英文关键词 volatile organic compounds (VOCs) Shenyang seasonal distribution diurnal variation spatial distribution source identification |
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| 中文摘要 |
| 2008年4月～2009年7月间，选取沈阳市不同功能区5个监测点位,采集了4个不同季节的大气VOCs样品187个，利用三级冷阱预浓缩-GC-MS方法测定了108种大气VOCs物质，考察了沈阳市大气VOCs浓度水平及其时空分布情况，并对其主要的来源进行识别. 结果表明，沈阳市大气总VOCs平均质量浓度为(371.0±132.4)μg/m3，其中含量最高的组分为含氧化合物（57.2%），其次为卤代烃（20%），烷烃（11.4%）、芳香烃（8.5%）和烯烃（3.0%）. 全市大气总VOCs浓度呈现出春秋浓度较高，冬夏浓度较低的季节变化特征. 主要受工业排放源的影响，商业中心点大气VOCs浓度在冬季的08:00～10:00时段、 12:00～16:00时段和20:00～22:00时段均出现峰值，而夏季则呈现出10:00～12:00时段和18:00～20:00时段的双峰现象. 工业区点位和商业中心区点位浓度高于其它功能区点位，清洁对照点周围由于没有明显的大气VOCs排放源，浓度水平最低. 相关性和比值分析结果表明，机动车燃烧、煤炭生物质燃烧、汽油溶剂挥发和工艺过程是沈阳市大气VOCs的主要来源. |
| 英文摘要 |
| From April, 2008 to July, 2009, 187 atmospheric samples in four different seasons were collected from five sites in Shenyang. The 108 species of VOCs were measured by using the method of pre-concentration-GC-MS. The objectives of this study were to investigate the VOCs pollution level as well as its spatial and temporal distribution, and to identify the main source in Shenyang city. The results showed that the average total mass concentration of VOCs in Shenyang was 371.0±132.4 μg/m3.The major components were oxygen-containing compounds, halogenated hydrocarbon, alkanes, aromatics and alkenes, which accounted for 57.2%, 20%, 11.4%, 8.5%, and 3.0% of the total mass, respectively. A seasonal variation of VOCs across all the sampling sites was observed, with higher levels in spring and autumn and lower levels in winter and summer. Related with industrial emission, the diurnal variation of the total mean VOCs concentrations at downtown site showed three peaks in winter and two peaks in summer. The VOCs levels in the industrial and downtown areas were higher than those in other areas, with the lowest concentration observed at clean air site with no emission source around. From the results of correlation analysis and concentration ratios analysis, the VOCs pollutants in Shenyang were mainly contributed by automobile exhaust, coal & biofuel combustion, gasoline & solvent evaporation and industrial process. |
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