【摘要】 在石家庄市城区内采集2019年全年大气细颗粒物(PM_2.5)样品,采用气相色谱—质谱法测定其中多环芳烃（PAHs）浓度,分析了石家庄市PM_2.5中PAHs的不同时期污染水平、组成特征及主要来源。结果表明,石家庄市PM_2.5中总多环芳烃（ΣPAHs）质量浓度年均值为74.12 ng/m³,季节规律为春季（19.66 ng/m³）<夏季（53.52 ng/m³）<秋季（61.03 ng/m³）<冬季（145.16 ng/m³）,月平均浓度为16.51～230.40 ng/m³;单体BkF和Chry的月、季、年均浓度均在ΣPAHs中占比最高;环数分布特征为4环和5环的PAHs含量明显高于3环和6环的;采用特征化合物比值法分析,石家庄市PM_2.5中PAHs污染主要来自于液体石化燃料、煤炭和生物质燃烧源。更多还原

【Abstract】 Samples of fine particulate matter (PM_2.5) were collected in the urban area of Shijiazhuang in 2019.The concentration of polycyclic aromatic hydrocarbons （PAHs） in PM_2.5was determined by gas chromatography-mass spectrometry（GC-MS）.The pollution level,composition characteristics and main sources of PAHs in PM_2.5in Shijiazhuang were analyzed in different periods.The results showed that the average annual concentration of total polycyclic aromatic hydrocarbons （ΣPAHs） in PM_2.5in Shijiazhuang was 74.12 ng/m³,and the seasonal pattern was as follows:spring （19.66 ng/m³）<summer （53.52 ng/m³）<autumn （61.03 ng/m³）<winter （145.16 ng/m³）.The average monthly concentration ranged from 16.51 to 230.40 ng/m³.The monthly,seasonal and annual concentrations of monomer Bk F and Chry were the highest inΣPAHs.The PAHs content of 4 and 5rings was significantly higher than that of 3 and 6 rings;Using characteristic compound ratio method,PAHs pollution in PM_2.5in Shijiazhuang mainly comes from liquid petrochemical fuel,coal and biomass combustion sources.更多还原