呼和浩特城区冬季近地面挥发性有机物污染特征初步研究

挥发性有机物(VOCs)是环境空气监测的主要目标污染物。本文运用罐采样-三级冷阱预浓缩-中心切割-气相色谱(FID)/气质联用法对人群主要活动的近地面不同高度、不同时间段及不同区域的呼和浩特冬季大气环境中挥发性有机物进行定性定量分析。发现典型天气情况下,呼和浩特城区冬季近地面挥发性有机物组分中烷烃和芳香烃占比较高,城区西侧所监测点位挥发性有机物总量(TVOCs)浓度高于其他区域,且其浓度在高度和时段上存在明显差异。

Preliminary study on the characteristics of volatileorganic compound pollution near the ground in the winter of Hohhot City

Volatile organic compounds are the main target pollutants for environmental air monitoring.In this paper,the GC(FID)/GCMS method of tank sampling-three-stage cold trap pre-concentration-deans switch is used to qualitatively and quantitatively analyze volatile organic matter in the hohhot winter atmospheric environment of Hohhot in different heights,different time periods and different regions of the population’s main activities.It was found that under the typical weather conditions,alkanes and aromatic hydrocarbons accounted for relatively high in the late-terrestrial volatile organic components of Hohhot city in winter,and the total concentration of volatile organic compounds at the points monitored on the western side of the city was higher than in other regions,and the concentration satout significantly in height and time period.