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典型钢铁企业VOCs污染特征及SOA生成潜势估算
盛涛,高松,高宗江,欧阳静静,崔虎雄,伏晴艳,陆闻玺,等
作者单位E-mail
盛涛 上海市环境监测中心 shengtao0628@163.com 
高松 上海市环境监测中心 gs@semc.gov.cn 
高宗江 上海市环境监测中心  
欧阳静静 宝钢工程集团上海宝钢工业技术服务有限公司  
崔虎雄 上海市环境监测中心  
伏晴艳 上海市环境监测中心  
陆闻玺 宝钢工程集团上海宝钢工业技术服务有限公司  
摘要:
使用在线监测仪器于2016年7月对典型钢铁企业VOCs、PM2.5和NMHC等污染物进行观测,同时基于FAC系数估算了该区域的二次有机气溶胶(SOA)生成潜势。结果表明,观测期间总VOCs浓度为106.08±63.81μg/m3,和NMHC的相关系数R2达到了0.8(P<0.05)以上;主要组分包括烷烃(47.2%)和芳烃(43.3%),芳烃占比明显高于城区;高浓度VOCs期间,芳烃占比高达46.0%,可能与钢铁企业在炼焦时苯系物(苯、甲苯、二甲苯)排放有关。VOCs、NMHC、烷烃、芳烃和乙炔均呈现早晚高峰值的日变化特征,而烯烃由于异戊二烯受天然源排放影响,呈午间单峰值的特征。观测期间的SOA生成潜势为2.54μg/m3,较城区高出76.4%,显示钢铁企业SOA对PM2.5具有一定贡献;其中芳烃对SOA生成贡献高达97.2%,主要贡献组分包括苯、间/对-二甲苯、乙苯、苯、邻-二甲苯。
关键词:  钢铁企业  VOCs  污染特征  SOA生成潜势
DOI:
分类号:X32
基金项目:上海市科委科研计划项目(No.15DZ1205300);上海市环保科研(沪环科[2015]第2 号);环境保护部公益性行业科研专项(No.201409019)
Characteristics of VOCs in Typical Iron and Steel Industry and Estimation of Secondary Organic Aerosol Formation Potential
SHENG Tao,GAO Song,GAO Zongjiang,OUYANG Jingjing,Cui Huxiong,FU Qingyan,Lu Wenxi,et al
Abstract:
In this study, the pollution characteristics of VOCs, PM2.5, and NMHC of typical iron and steel industry were observed by application of on-line monitoring instruments in July 2016, meanwhile, the secondary organic aerosol(SOA) formation potential was estimated based on the FAC coefficient. The results showed that the concentration of VOCs was 106.08±63.81μg/m3 during the observation period, which was well correlated with that of NMHC, with a correlation coefficient of 0.8 (P<0.05). The main components of detected VOCs were alkanes (47.2%) and aromatic hydrocarbons (43.3%),and the proportion of aromatic hydrocarbons was obviously higher than that of urban areas. During the period of high VOCs concentration, aromatic hydrocarbons contributed 46.0% of VOCs, which could be attributed to the emission of BTEX (benzene, toluene, ethylbenzene and xylene) of coking in iron and steel industry. The peak concentrations of VOCs, NMHC, alkanes and aromatic hydrocarbons appeared twice in the morning and evening, respectively, whereas the diurnal variation of Olefin concentration was characterized with a single peak in the midday, as the concentration of isoprene was affected by natural source emissions. Additionally, the determined value of SOA formation potential during the study was 2.54μg/m3, which was 76.4% higher than that of urban areas, indicating SOA from steel enterprises has quite a contribution to PM2.5; and benzene, m-xylene, ethylbenzene, o-di-p-xylene as well as Toluene, considered as aromatic hydrocarbons contributed 97.2% to the formation of SOA.
Key words:  Iron and steel industry  VOCs  pollution characteristics  SOA formation potential