兰州工业区夏季挥发性有机物污染特征研究

Summer pollution characteristics of volatile organic compounds in Lanzhou industrial area

为研究兰州市西固区夏季挥发性有机物(VOCs)污染特征,利用挥发性有机物在线监测仪器等开展分析,研究臭氧、VOCs浓度水平、组分构成、臭氧生成潜势等,结果表明:监测期间(2019年7月1日-7月15日),臭氧和VOCs小时平均浓度分别为245μg/m^3和133.50μg/m^3;烷烃、芳香烃、烯烃、卤代烃、酮类排放强度相对较大,占比分别达到32%、25.8%、20.2%、13.9%、6.2%;臭氧生成主要受NO_x和VOCs共同控制;其中,乙烯、间/对-二甲苯、氯甲烷、邻-二甲苯等对VOCs浓度贡献最大;间/对-二甲苯、邻-二甲苯、乙烯、1,3-丁二烯等对臭氧生成影响最大;二次有机气溶胶生成潜势最高的VOCs物种为间/对-二甲苯、邻-二甲苯、乙苯、苯乙烯等。

In order to study summer pollution characteristics of volatile organic matter in Lanzhou xigu.Instruments such as volatile organic matter(VOCs) were used to conduct online monitoring and analyze ozone,VOCs concentration level,composition and ozone potential.The results showed that during the monitoring period(from July 1,2019 to July 15,2019),the average concentrations of ozone and VOCs were 245μg/m^3 and 133.50 μg/m^3,respectively.The emission intensity of alkanes,aromatic hydrocarbons,olefins,halogenated hydrocarbons and ketones was relatively large,accounting for 32%,25.8%,20.2%,13.9%and 6.2%,respectively.Ozone generation is mainly controlled by NOx and VOCs.Among them,ethylene,m-para-xylene,chloromethane and o-xylene contributed the most to VOCs concentration.Meso-para-xylene,o-xylene,ethylene,1,3-butadiene has the greatest influence on ozone generation;the VOCs species with the highest potential of secondary organic aerosol are m-p-xylene,o-xylene,ethylbenzene,styrene,etc.