| 保定市大气气溶胶中正构烷烃的污染水平及来源识别 |
| 摘要点击 3106 全文点击 1486 投稿时间：2012-04-24 修订日期：2012-08-17 |
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| 中文关键词 保定 大气气溶胶 正构烷烃 污染特征 来源识别 |
| 英文关键词 Baoding particulate matters n-alkanes pollution characteristics source identification |
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| 中文摘要 |
| 有机物已成为我国城市大气颗粒物中最重要组成部分.为认知河北工业城市大气颗粒物中有机物浓度水平和来源,于2010年9月~2011年8月,利用安德森9级惯性撞击式颗粒物采样器在河北省保定市采集了大气颗粒物样品,采用有机溶剂萃取-气相色谱/质谱法定量分析了其中的正构烷烃.结果表明,采样期间保定市大气细粒子日均浓度67%超过GB 3095-2012二级标准75 μg·m-3,约96%超过国家可吸入颗粒物浓度标准 150 μg·m-3.颗粒物中检测出C14~C32正构烷烃19种,浓度范围111.23~979.81 ng·m-3,日均浓度264.2 ng·m-3; 4个季节的主峰碳各有不同,冬春季主峰碳为C20、C21和C22,夏季为C27; 春、夏、秋、冬CPI值分别为0.97、1.24、0.92、0.86, 平均值为1.01.冬春季正构烷烃主要受控于化石燃料燃烧和汽车尾气排放,夏秋季还同时受到高等植物角质蜡层的挥发影响,全年以人为源的影响为主. |
| 英文摘要 |
| Organic matter has been a very important component in the ambient particulate matter of big cities in China. In order to investigate the mass concentrations and sources of the organic matter which are adsorbed in ambient particulate matters in the industry cities of Hebei province, aerosol samples were collected with Anderson sampler during Sep. 2009 to Aug.2010, in Baoding city, Hebei province. The concentration of n-alkanes was determined via GC-MS. About 66.7% of the daily average concentrations of fine particulate matters were higher than the 24-hour average threshold value of class Ⅱ standard of the ambient air quality standard (GB 3095-2012, 75 μg·m-3). About 96% of the daily average concentrations of inhalable particles were higher than 150 μg·m-3(GB 3095-2012). The total concentration of n-alkanes was in the range of 111.23-979.81 ng·m-3 with an average of 264.2 ng·m-3. The n-alkene homologues from C14 to C32 were detected with different peak carbon numbers ranging from 20 to 27 in different seasons. In summer, the peak carbon number was 27, while it was C20, C21 or C22 in winter and spring. The CPI values were 0.97, 1.24, 0.92 and 0.86 in spring,summer, autumn and winter, respectively, with an average of 1.01.These results indicated that the incomplete combustion of fossil fuel and vehicle emissions was the main resource of n-alkanes in winter and spring, and the high plant waxes were playing a major role in summer and autumn. The primary sources were anthropogenic activities all year round. |
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