【摘要】 在武汉市工业区和交通区展开了PM_2.5样品采集,研究了PM_2.5中二元羧酸的化学组成、污染水平及来源。二元羧酸在工业区为103.1～2 219.2ng/m³,年平均值为958.4ng/m³;在交通区为66.9～2 176.8ng/m³,年平均值为749.7ng/m³。丙二酸/丁二酸（C₃/C₄,质量比,下同）表明,武汉市二元羧酸主要来自机动车尾气排放;己二酸/壬二酸（C₆/C₉）表明,二元羧酸的人为源贡献大于自然源。正定矩阵因子分解（PMF）模型解析结果显示,工业区中二次源占13.7%,建筑扬尘占23.1%,机动车尾气排放占37.0%,生物质燃烧占26.2%;交通区中二次源占8.9%,建筑扬尘占24.9%,机动车尾气排放占51.8%,生物质燃烧占14.4%。潜在源区贡献因子（PSCF）分析得出,武汉市夏季二元羧酸主要受到南部季风的影响,冬季主要受到西部冷空气的影响。更多还原

【Abstract】 PM_2.5 samples were collected in an industrial area and a traffic area to investigate the composition,concentration and source of dicarboxylic acids in PM_2.5.The mass concentration of dicarboxylic acids in industry area was 103.1-2 219.2 ng/m³,with the annual average of 958.4 ng/m³,while the mass concentration in traffic area was 66.9-2 176.8 ng/m³,with the annual average of 749.7 ng/m³.Malonate/succinic acid（C₃/C₄,mass ratio,the same below）showed that the dicarboxylic acids in Wuhan were mainly derived from the influence of motor vehicle emissions,and adipic acid/azelaic acid（C₆/C₉）indicated that the anthropogenic contribution of dicarboxylic acids was greater than that of natural source.The results of positive matrix factorization（PMF）model showed that the secondary sources accounted for 13.7%in the industrial area,dust for 23.1%,motor vehicle emissions for 37.0%,and biomass combustion for 26.2%.Secondary sources accounted for 8.9% in the traffic area,dust for 24.9%,motor vehicle emissions for 51.8%,and biomass combustion for 14.4%.The analysis of the potential source contribution function（PSCF）suggested that the dicarboxylic acids in Wuhan were mainly affected by the southern monsoon in summer,and cold air from the west in winter.更多还原