上海城郊地区冬季霾污染事件反应性VOCs物种特征

发布时间：2018-05-06 06:42

本文选题：VOCs + PMF　；参考：《环境科学》2017年03期

【摘要】：基于大学城站点冬季霾污染时段在线气相色谱连续观测数据,分析了高污染时段VOCs污染特征和不同霾污染情况下VOCs光化学反应活性物种.观测期间共检测到55种VOCs物种(PAMs),735个有效样本,ΣVOCs体积分数范围在25.5×10~(-9)~1 320.3×10~(-9)(avg±SD,240×10~(-9)±181×10~(-9))之间.甲苯和间/对-二甲苯是两个高污染时段的特征污染物,其体积分数超过工业区边界站的体积分数,且高污染时段与工业区站点有相似的组分特征,可能受到附近工业区影响较大.VOCs组分小时变化呈现夜间高白天低的特点,臭氧的小时体积分数变化与之相反.通过分析污染物的光化学反应活性,芳香烃对OFP的贡献率最高,达到70.0%,其次是烯炔烃(16.7%).西北风向的OFP值为2 078.2×10~(-9),是其他风向的4倍,平均MIR值也高于本市其他工业区点位;该地区不同程度霾污染下芳烃均是OFP贡献的主导污染物,其中,甲苯和间/对-二甲苯的贡献率之和超过50%.应用PMF5.0对污染物进行来源解析,得到4个因子,分别为含汽油污染源及机动车尾气排放、石油炼制加工、溶剂使用、有机合成材料制造;其贡献率分别为:33.1%、31.5%、30.5%、4.9%.
[Abstract]:Based on the continuous data of on-line gas chromatographic observation in winter haze pollution period of university city station, the characteristics of VOCs pollution in high pollution period and the photochemical active species of VOCs under different haze pollution conditions were analyzed. A total of 735 effective samples of 55 species of VOCs were detected during the observation period. The volume fraction of 危 VOCs ranged from 1 320.3 脳 10~(-9)(avg 卤240 脳 10 ~ (-9) 卤181 脳 10 ~ (-9) to 1 320.3 脳 10 ~ (10) 10~(-9)(avg. Toluene and m / p xylene are characteristic pollutants in two high pollution periods, whose volume fraction exceeds the volume fraction of the industrial boundary station, and the high pollution period has similar component characteristics to the industrial zone station. The hourly variation of VOCs may be greatly affected by the industrial area nearby. The hourly volume fraction change of ozone is contrary to that of high daytime and low night. By analyzing the photochemical reaction activity of pollutants, the contribution rate of aromatic hydrocarbons to OFP is the highest, reaching 70.0, followed by alkynes and alkynes. The OFP value of northwest wind direction is 2 078.2 脳 10 ~ (10) ~ (-9), which is 4 times of that of other wind directions, and the average MIR value is also higher than that of other industrial zones in this city, where aromatics are the dominant pollutants contributed by OFP in different degree of haze pollution. The total contribution rate of toluene and p-xylene is more than 50%. The sources of pollutants were analyzed by PMF5.0, and four factors were obtained, including gasoline pollution sources and vehicle exhaust emissions, petroleum refining and processing, solvent use, organic synthetic materials manufacture, and their contribution rates were 31.5% and 30.5% and 4.9% respectively.
【作者单位】：华东理工大学资源与环境工程学院国家环境保护化工过程环境风险评价与控制重点实验室;上海市环境监测中心;上海中学;
【基金】：国家重点研发计划项目(2016YFC0200500) 国家自然科学基金项目(21277044)
【分类号】：X513

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