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西安市某工业园夏季VOCs浓度特征及O3、SOA生成潜势
Characteristics of VOCs and Formation Potential of O3 and SOA in an Industrial Zone in Xi’an in Summer
投稿时间:2021-01-08  修订日期:2021-04-06
DOI:10.19316/j.issn.1002-6002.2021.06.06
中文关键词:  挥发性有机物  二次有机气溶胶  臭氧生成潜势  PMF  工业园区  手工采样监测
英文关键词:VOCs  secondary organic aerosol  ozone formation potential  PMF  industrial zone  manual sampling monitoring
基金项目:
作者单位
郑欢 西安高新区环境保护研究所, 陕西 西安 710055
西安高新区监测中心, 陕西 西安 710055 
毛东 西安高新区环境保护研究所, 陕西 西安 710055
西安高新区监测中心, 陕西 西安 710055 
解梦怡 西安高新区环境保护研究所, 陕西 西安 710055
西安高新区监测中心, 陕西 西安 710055 
高云天* 西安高新区环境保护研究所, 陕西 西安 710055
西安高新区监测中心, 陕西 西安 710055 
贾红建 西安高新区环境保护研究所, 陕西 西安 710055
西安高新区监测中心, 陕西 西安 710055 
王博通 西安高新区环境保护研究所, 陕西 西安 710055 
马莹 西安高新区环境保护研究所, 陕西 西安 710055 
张新 西安高新中凯环境检测有限公司, 陕西 西安 710055 
通讯作者:高云天*  西安高新区环境保护研究所, 陕西 西安 710055;西安高新区监测中心, 陕西 西安 710055  
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中文摘要:
      2020年7月30日—10月10日对西安市某工业园区大气中的70种VOCs开展了为期73 d的VOCs手工采样监测,分析了上、下风向2个点位VOCs浓度组成特征、O3生成潜势和SOA生成潜势,并运用PMF进一步分析该区域VOCs的主要来源。结果显示:监测期间工业园区平均VOCs浓度为203.50 μg/m3,以甲醛和乙醛为主的醛酮类(148.37 μg/m3)是主要污染物,占TVOC浓度的57%~84%,其次是烷烃。通过上、下风向VOCs成分比较发现,醛酮类为高污染时段特征污染物,工业园区平均OFP为969.66 μg/m3,醛酮类对O3生成的贡献最大,占TOFP的80%~97%,其次是烯烃。工业园区平均SOAFP为0.50 μg/m3,芳香烃对SOA生成的贡献最大,占TSOAFP的48%~98%,其次是烷烃。PMF源解析得到5个因子,分别为工业源、溶剂涂料、燃烧源、移动源及其他源,贡献率分别占35.2%、20.4%、18.3%、12.8%、13.3%,解析显示该区域受到下风向电子产业影响较大。
英文摘要:
      From July 30 to October 10,2020, a 73-day manual sampling and monitoring of 70 VOCs in the atmosphere of an industrial zone in Xi’an was carried out, and the composition characteristics of VOCs concentration, formation potential of O3 and SOA at two points in the upper and lower wind directions were analyzed, and PMF was used to further analyze the main sources of VOCs in the region. The results showed that the average concentration of VOCs in the industrial zone was 203.50 μg/m3 during the monitoring period. Aldehydes and ketones dominated by formaldehyde and acetaldehyde (148.37 μg/m3) were the main pollutants, accounting for 57%-84% of TVOC concentration, followed by alkanes. By comparing the components of VOCs in the upper and lower wind directions, it is found that aldehydes and ketones were characteristic pollutants during periods of high pollution. The average OFP of industrial park was 969.66 μg/m3. Aldehydes and ketones contributed the most to O3 formation, accounting for 80%-97% of TOFP, followed by olefins, accounting for 10% of TOFP. The average SOAFP in industrial zone was 0.50 μg/m3. Aromatic hydrocarbons contributed the most to SOA formation, accounting for 48%-98% of TSOAFP, followed by alkanes, accounting for 43% of TSOAFP. According to the PMF, VOCs sources in the study area were identified among industrial sources, solvent use, combustion sources, vehicle exhaust and other sources, which contributed 35.2%, 20.4%, 18.3%, 12.8% and 13.3%, respectively to the ΣVOCs concentrations, and the region was greatly affected by the downwind electronic industry.
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