镇江市商业综合体地下停车场内污染物排放特征及臭氧生成潜势分析

Characterization of pollutants emission and ozone formation potential of underground parking lot of commercial complex in Zhenjiang City

基于对镇江市某商业综合体地下停车场内定点在线监测,分析不同监测时段VOCs浓度水平、组分特征、臭氧生成潜势、臭氧生成潜势的主要VOCs贡献物种以及六项污染物(CO,PM_(10),PM_(2.5),NO_(2),O_(3),SO_(2))排放特征。结果表明:综合体地下停车场整体TVOC浓度较高,均值为768.65 ppbv;5个监测时段的VOCs组分占比表现为醇酸酯、芳香烃、醛酮类和烷烯烃类占比较高,VOCs优势物种为乙醇、乙醛和二甲苯。VOCs物种的臭氧生成潜势计算结果主要表现为二甲苯、丙烯、乙醛、丁烯等物种的臭氧生成潜势较高。综合体地下停车场5个时段CO,PM_(10),PM_(2.5),NO_(2),O_(3),SO_(2)六项污染物平均浓度分别为5766.46,159.73,81.47,41.50,70.56μg/m^(3)和3.97μg/m^(3),其中CO平均浓度最高,在所有污染物中影响最大。

Based on the fixed-point online monitoring of the underground parking lot of commercial complex in Zhenjiang City,different monitoring periods were analyzed of VOCs concentration,components of VOCs,ozone generation potential,major VOCs contributing species of ozone generation potential,and emission characteristics of six pollutants(CO,PM_(10),PM_(2.5),NO_(2),O_(3),SO_(2)).The results showed that the overall TVOC concentration in the underground parking lot of the complex was higher,with an average of 768.65 ppbv.In the 5 monitoring periods,the VOCs included a relatively high proportion of alkyd esters,aromatic hydrocarbons,aldehydes and alkenes.The dominant VOCs species were ethanol,acetaldehyde and xylene.The calculation results of ozone formation potential of VOCs species mainly showed that xylene,propylene,acetaldehyde,butene and other species had higher ozone formation potential.The average concentrations of CO,PM_(10),PM_(2.5),NO_(2),O_(3) and SO_(2) in the underground parking lot of the complex were 5766.46,159.73,81.47,41.50,70.56 and 3.97μg/m^(3),respectively.CO has the highest average concentration and has the greatest influence among all pollutants.