韶关市大气颗粒物多环芳烃的污染特征研究

Pollution Characteristics of Polycyclic Aromatic Hydrocarbons in Atmospheric Particulates in Shaoguan City

采集韶关市PM_(10)和PM_(2.5)样品,采用气相色谱-质谱法测定了16种PAHs的质量浓度,分析了16种PAHs在PM_(2.5)中的时空分布特征,研究16种PAHs在PM_(10)和PM_(2.5)中分布的差异。结果显示:PAHs在PM_(2.5)中的季节性分布具有冬、夏季高,春、秋季低的特点,且苯并[a]蒽、苯并[k]荧蒽、苯并[c]芘、苯并[a]芘、荧蒽等在一年四季含量均较高;在空间上的分布显示交通区>工业区>商业区>居民区>休闲区。PAHs在PM_(2.5)中的分布明显高于在PM_(10)中的分布,在人为活动较为频繁的季节和区域,PAHs的含量明显增加。

The sample of PM_(10) and PM_(2.5)were collected in Shaoguan city. GC / MS technique was used to analysis mass concentration of 16 kinds PAHs,and spatial and temporal distribution characteristics of 16 kinds PAHs were study in PM_(2.5),and their distributional difference between PM_(10) and PM_(2.5). The result show that PAHs have higher content in Winter or Summer,and low content in spring or autumn,but anthracene( Ba A),benzo k fluoranthene,Benzo[c]pyrene and benzopyrene have higher content throughout the year. Spatial distribution characteristics for 16 kinds PAHs in PM_(2.5)is traffic area > Industrial district > commercial area > residential area > leisure area. The distribution of PAHs in PM_(2.5)is significantly higher than in the distribution of PM_(10),the content of PAHs increased significantly In human activities more frequent season and area.