濮阳市VOCs污染特征及其臭氧生成潜势分析

以京津冀及周边"2+26"城市之一濮阳为例,对环境空气VOCs的污染特征及其臭氧生成潜势进行分析。研究表明:濮阳市的臭氧生成对VOCs浓度比较敏感,VOCs各组分的平均浓度表现为含氧有机物>烷烃>芳香烃>烯烃>炔烃,乙烯和丙酮是浓度水平最高的2种物质,对VOCs浓度贡献分别为11. 3%和10. 5%;VOCs各组分的臭氧生成潜势量表现为含氧有机物>芳香烃>烯烃>烷烃>炔烃。OFP排名前三位的是乙醛、乙烯和甲苯,其对臭氧生成的贡献量超过了总量的三分之一;制定关键物质选取原则,筛选出濮阳市VOCs的关键种类;VOCs及其关键种类与气温和风向存在一定的相关关系;濮阳市VOCs关键种类的污染主要来源于化石燃料燃烧、石油化工生产和溶剂涂料挥发等工业生产和机动车尾气排放等。

Analysis of VOCs Pollution Characteristics and Ozone Generation Potential in Puyang

Taking Puyang,one of the“2+26”in Beijing-Tianjin-Hebei and surrounding areas as an example,the pollution characteristics of air VOCs and their ozone generation potential were analyzed in this study.The results showed that ozone generation was sensitived to VOCs concentration in Puyang.The average concentration of each component of VOCs was oxygenated organic matter>alkane>aromatic hydrocarbon>olefin>alkyne,ethylene and acetone were the two species with the highest concentration,contributing 11.3%and 10.5%to VOCs concentration respectively.The ozone generating potential of each component of the VOCs was represented by oxygenated organic matter>aromatic hydrocarbon>olefin>alkane>alkyne.The top three species in OFP were acetaldehyde,ethylene and toluene,which contributed more than one-third of the total ozone production.The key species selection principles were developed and the key species of VOCs in Puyang were screened out.There was a certain correlation between VOCs and their key species with temperature and wind direction.The pollution of key species of VOCs in Puyang mainly comed from industrial production of fossil fuel combustion,petrochemical production and solvent coating volatilization,and vehicle exhaust emissions.