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河北涞水县大气细粒子单颗粒分析表征及来源识别
董树屏1, 杜祯宇1, 梁金玲2, 于飞2, 陈航宇3, 李玉武1, 殷惠民1
1.国家环境分析测试中心;2.河北涞水县环境监测站;3.北京化工大学
摘要:
采用单颗粒分析技术对河北涞水县2015年三个典型污染时段7个大气颗粒物样品进行了分析表征。共计测量了1506个颗粒物(粒径≥0.5 μm),其中粒径小于2.5 μm的颗粒占到98%以上,测量结果显示了细颗粒污染特征。碳质颗粒为主要颗粒物种类,其检出数目百分比在90%以上。非供暖期严格管控时段,当地居民日常生活产生的球形碳质颗粒检出数目百分比最高;非供暖期正常管控时段,机动车排放的碳质集合体颗粒检出数目百分比最高,交通污染贡献最大。供暖期球形碳质颗粒检出的数目百分比最高,含硫颗粒检出数目百分比相对增加,燃煤的贡献最大。48小时气团后向轨迹分析结果表明,颗粒物污染水平较低(空气质量良好)情况下,影响研究区域空气质量的主要是本地源;雾霾天气(处于严重污染状态时)下,西南方向外来源和本地源一起构成研究区域的颗粒物污染状态。
关键词:  扫描电镜-能谱仪  单颗粒分析  颗粒物污染来源  气团后向轨迹
DOI:
分类号:X831;O657
基金项目:国家重大科学仪器设备开发专项(2013YQ120353)
Research on Individual-Particle Analysis and Sources of Atmospheric Fine Particles in Laishui County,Hebei Province
陈航宇,et al
Abstract:
Individual-particle analysis was performed on 7 samples of atmospheric particles collected in 3 typical periods of atmosphere pollution in Laishui County. In total 1506 particles (diameter larger than 0.5 μm) were measured, and the diameter of more than 98% particles were less than 2.5 μm, indicating a characteristic of severe fine particle pollution. During the China military parade, a non-heating period with strict atmospheric control policies implemented, the spherical carbon-rich particles, which were mainly from daily activities of citizens, had the highest number abundance among all particles. During normal non-heating days, abundance of vehicle-emitted soot aggregates was the highest, which showed the largest contribution of traffic to particle pollution. Abundance of spherical carbon-rich particles was highest during heat-period, while the abundance of S-rich particles were significantly increased, implying the main contribution of coal combustion emission to air pollution. Combined with 48-h analysis of air mass back trajectories, it was concluded that the local sources was the main cause of pollutants during periods with low level air pollution, while external and local sources both play an important role during periods with severe air pollution in Laishui County.
Key words:  SEM/EDS system  individual particle  source of particle pollution  back trajectory of air mass