摘要
以无锡市新吴区为研究对象,采用走航监测技术对区域内挥发性有机物(VOCs)进行高时空分辨率监测,结合地理信息系统(GIS),分析了VOCs的时空分布特征、主要组分及臭氧生成潜势。结果表明,新吴区整体VOCs均值浓度28.9 μg/m3。从VOCs组分上看,芳香烃和卤代烃占比较高分别为29%和26%。各区域峰值差异显著,高新A区峰值(22392.6 μg/m3)远超其他区域。从整体上分析,春季VOCs浓度均值最高。主要由于春季气温回升,大气扩散条件差,新吴区是工业集中区,涉及VOCs排放的行业(如电子、化工、汽车制造等)在春季生产恢复而提高排放量。结合各街道VOCs组分的质量浓度发现,部分组分浓度较大且出现频率较高,如甲苯、二甲苯。机动车尾气、工业溶剂挥发都含有大量苯系物,应重点关注对苯系物排放控制。新吴区OFP前十位VOCs关键活性物种分别为二甲苯/乙苯、甲苯、丁烯、戊烯、三甲苯、丁烷/丙酮、1,3-丁二烯、二乙基苯、己烯/甲基环戊烷、甲基环己烷。初步判定新吴区大气中的VOCs来源于工业溶剂的挥发。之后应主要涉及溶剂使用、涂料使用等工艺的企业针对性管控。研究结果为区域VOCs精细化管控提供了科学依据,对制定精准的污染管控策略具有重要指导意义。
Taking the Xinwu District of Wuxi City as the research object, we used mobile monitoring technology to conduct high spatial and temporal resolution monitoring of volatile organic compounds (VOCs) in the region. By combining this with geographic information systems (GIS), we analyzed the spatial and temporal distribution characteristics of VOCs, their main components, and ozone generation potential. The results show that the overall average concentration of VOCs in Xinwu District is 28.9 μg/m3. In terms of VOC components, aromatic hydrocarbons and halogenated hydrocarbons accounted for relatively high proportions, at 29% and 26%, respectively. There are significant differences in peak values among different areas, with the peak in the High-tech A area (22,392.6 μg/m3) far exceeding those in other areas. Overall analysis shows that the average concentration of VOCs is highest in spring. This is mainly due to the rising temperatures and poor atmospheric diffusion conditions in spring. Xincheng District is an industrial concentration area, where industries related to VOC emissions (such as electronics, chemicals, automobile manufacturing, etc.) resume production and increase emissions in spring. Analyzing the mass concentrations of VOC components from various streets reveals that some components have higher concentrations and occurrence frequencies, such as toluene and xylene. Vehicle exhaust and industrial solvent volatilization contain a large amount of benzene series substances, and emphasis should be placed on controlling emissions of benzene series substances. The top ten key active VOC species in Xinhua District are xylene/ethylbenzene, toluene, butene, pentene, trimethylbenzene, butane/acetone, 1,3-butadiene, diethylbenzene, hexene/methylcyclopentane, and methylcyclohexane. It is preliminarily determined that the VOCs in the atmosphere of Xinhua District originate from the volatilization of industrial solvents. Subsequent measures should primarily involve targeted management of enterprises related to solvent and coatings usage. The research results provide a scientific basis for the fine management of regional VOCs and serve as important guidance for formulating precise pollution control strategies.
出处
《环境保护前沿》
2025年第8期1053-1061,共9页
Advances in Environmental Protection
