太原市采暖大气挥发性有机物(VOCs)污染特征

Characteristics of Atmospheric Volatile Organic Compounds( VOCs)During Heating Period in Taiyuan

本研究于2017年10月和12月使用苏玛罐对太原市采暖期前及进入采暖期后大气VOCs进行采集,并用气相色谱-质谱仪/火焰离子检测器(GC-MS/FID)对57种VOCs进行分析。结果表明,进入采暖期后,VOCs的总体浓度由51. 98μg/m^3升高至102. 43μg/m^3,在两个阶段中,各类VOCs均呈现烷烃>芳香烃>烯烃>炔烃的趋势,苯和丙烯最为显著;比值分析结果得出,太原市受本地排放影响较大,且燃烧源为主要排放源。利用气溶胶生成系数(FAC)估算两个阶段的SOA的生成潜势,发现进入采暖期后,SOA生成潜势有大幅度的升高,芳香烃对SOA的贡献最大,且甲苯、苯和间/对-二甲苯是对SOA生成贡献大的物种。

In October and December 2017,the ambient VOCs were collected by SUMMA canister before and during the heating period in Taiyuan,and 57 kinds of VOCs were analyzed by GC-MS/FID. The results showed that the VOCs concentration increased from 51. 98 μg/m^3 to 102. 43 μg/m^3 entering the heating period. In the two period,VOCs showed the trend of alkanes > aromatics > alkene > alkynes,and entering the heating period,benzene and propylene were the most significant;the ratio analysis results showed that Taiyuan is greatly affected by local emissions,and the combustion source is the main emission source. Using FAC to estimate the formation potential of SOA in two stages,it is found that entering the heating period,the formation potential of SOA is significantly higher than that before the heating period,Aromatic contributes most to SOA,and toluene,benzene and m/p-xylene were the top 5 largest contributors to SOA production.