|GAO Geng-shen, CHI Feng, MAO Jin-qun,QIN Jun-hu, XU lan.Pollutant Characterization of Polycyclic Aromatic Hydrocarbons（PAHs）in Atmospheric Fine Particulate Matter in Guiyang City[J].Environmental Monitoring and Forewarning,2019,11(4):43-47
|对贵阳市不同功能区在不同季节大气PM2.5中多环芳烃（PAHs）进行了采样观测，利用UVD和FLD双检测器串联HPLC法分析了16种优控PAHs。结果显示，在贵阳市主城区PM2.5中PAHs有检出，5个采样点全年ρ（∑PAHs）为4.44～114 ng/m3，平均值为24.96 ng/m3，其值呈现出夏季最低冬季最高的特征，各个功能区在不同季节ρ（PAHs）不同，大小趋势也不同；四季PAHs单体中均以4-6环为主，占ρ（∑PAHs）的68%以上；PAHs来源解析结果显示，贵阳市大气PM2.5中PAHs来源具有明显的季节特征，春、夏和秋季主要来源是石油燃烧排放，兼有少量的生物质燃烧排放，冬季PAHs主要来源是燃煤和石油燃烧排放。PM2.5中PAHs毒性评价结果表明，贵阳市大气中PAHs的春季、夏季和秋季健康风险较小，冬季健康风险较大。四季各功能区ρ（BaP）大部分均低于《环境空气质量标准》（GB 3095—2012）规定限值（2.50 ng/m3），但冬季除背景点外，其他监测点均超标，最大超标倍数为3.80倍。
|关键词: 细颗粒物 多环芳烃 苯并［a］芘 健康风险 贵阳市
|Pollutant Characterization of Polycyclic Aromatic Hydrocarbons（PAHs）in Atmospheric Fine Particulate Matter in Guiyang City
GAO Geng-shen, CHI Feng, MAO Jin-qun,QIN Jun-hu, XU lan1,2
1.Guizhou Environmental Scientific Research and Design Institute，Guiyang, Guizhou 550081,China;2.2. Xiamen Lawlink Development CO.Ltd.,Xiamen, Fujian 361008,China
|Polycyclic aromatic hydrocarbons（PAHs） in atmospheric fine particles in different seasons and different function areas of Guiyang city were sampled and observed, 16 priority PAHs were analyzed by using HPLC equipped with UVD and FLD dual detector. The results showed that PAHs of PM2.5 were found in Main Urban Area of Guiyang, the total annual concentration ranged from 4.44 ng/m3 to 114 ng/m3, of which the lowest concentration appeared in summer while the highest concentration in winter, and the average concentration was 24.96 ng/m3 in five sampling sites. In different seasons, the concentration of PAHs of the atmospheric PM2.5 in different functional areas was varied, and the change trend was different. PAHs were dominated by 4-6 ring monomers, which accounted for more than 68% of the total concentration. Sources apportionment results indicated that the source of PAHs in PM2.5 in Guiyang showed obvious seasonal characteristics, the main source was fossil oil combustion in spring, summer and autumn, there were also a small amount of biofuel combustion, and the main source in winter was coal and fossil oil combustion. The toxicity evaluation results of PAHs in fine particulate matter showed that PAHs in the atmosphere of Guiyang had lower health risks in spring, summer and autumn but higher health risks in winter.The concentrations of benzo［a］pyrene which is strong carcinogenic were below the GB 3095—2012 limits(2.50 ng/m3). However, except for the background sampling sites, the other sampling sites all exceeded the standard limits in winter, and the maximum value exceeded the standard ratio of 3.80 times.
|Key words: PM2.5 Polycyclic aromatic hydrocarbons(PAHs) Benzo［a］pyrene Health risks Guiyang