大气PM_(10)中多环芳烃的污染特征

利用GC-MS对2008年5月至11月淮南市5个采样点大气可吸入颗粒物(PM10)样品进行分析,总结了研究区内PM10及其中16种PAHs的浓度特征、季节变化规律和来源解析.结果表明,不同采样点PM10浓度均偏高,超标率为14%—238%;PM10浓度水平为谢家集田十五小大通三小淮化集团理工校园.研究区内16种PAHs浓度总量的范围在15.20ng.m-3—111.58ng.m-3之间,平均浓度为64.36ng.m-3,4环以上的稠环芳烃占总浓度的86%.PAHs总量的季节变化与采样时环境温度显示出较好的负相关性,即秋季春季夏季.运用多环芳烃比值综合判断,淮南市大气PM10中PAHs主要以燃煤和机动车尾气混合来源为主,石油源和木材燃烧来源的贡献较小.

STUDY ON THE POLLUTION CHARACTERISTICS OF POLYCYCLIC AROMATIC HYDROCARBONS IN ATMOSPHERIC PM_(10) IN HUAINAN CITY, CHINA

Inhalable participate samples were collected at five different sites in Huainan city from May to November, 2008.The samples were analyzed for PM_(10) and 16 PAHs using GC-MS.The concentration, seasonal change and source identification of PM_(10) and sixteen PAHs were illustrated.Data showed the concentration of PM_(10) was relating high.The samples exceeding the standards were 14%-238%.Spatial distribution of PM_(10)was; Xiejiaji > Tianshiwuxiao > Datongsanxiao > Huaihuajituan > Ligongxiaoyuan.Concentrations of PAHs ranged from 15.20ng · m~(-3)-111.58ng · m~(-3), and the average value was 64.36ng · m~(-3).Seasonal variation of PAHs displayed negative correlation with the surrounding temperature, i.e., Autumn > Spring > Summer.Based on the PAH ratio, PAHs in PM_(10) came mainly from the combined sources of coal combustion and vehicle emission.The contribution of petroleum and wood was insignificant.