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《Journal of Safety and Environment》 2012-05
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Characteristics and sources of PM_(2.5) in typical atmospheric pollution episodes in Beijing

WANG Zhi-juan1,HAN Li-hui1,CHEN Xu-feng2,CHENG Shui-yuan1,LI Yue1,TIAN Chuan1,XIE Hui1(1 College of Environmental & Energy Engineering,Beijing University of Technology,Beijing 100124,China;2 Tangshan Environmental Monitoring Station,Tangshan 063000,Hebei,China)  
To study the characteristics and sources of PM2.5 in typical atmospheric pollution episodes during winter and spring in Beijing,the samples of PM2.5 were collected at the air quality monitoring site during winter and spring from 12/2010 to 03/2011.The periods are typical seasons for two types of heavy air pollution,i.e.haze and dust to happen often.Concentration of PM2.5,elements,water soluble ions and organic and elemental carbons of PM2.5 were analyzed for typical haze,dust,unpolluted weather during winter and spring.The results indicated that daily concentrations of PM2.5 during haze and dust days were up to 301.8 μg/m3 and 284.8 μg/m3,that were 8.62 and 8.14 times of the daily standard of EPA.Enrichment factor method was used to analyze the natural sources or anthropogenic sources of different elements during non heavy air pollution periods.Polluting elements S,Cu,Zn,As,Se,Cd,Sb,Pb were mainly released from coal combustion,motor vehicle exhaust and waste burnt;while Na,Mg,Al,Ca,Fe were main crustal elements.NH+4,NO-3,SO2-4 were found to be the dominant ionic species of PM2.5.The value of OC/EC(4.085) exceeded 2 suggesting that the OC of Beijing during haze belongs to secondary pollution source.Concentrations of anthropogenic source elements S,Cu,Zn,As,Se,Cd,Sb,Pb in PM2.5during haze were higher than that of unpolluted weather and dust.The concentrations of secondary inorganic particles NH+4,NO-3,SO2-4 and secondary organic carbons of PM2.5 during haze were higher than that of another two types of weather.Concentrations of crustal elements Na,Mg,Al,Ca,Fe during dust days were higher than that of unpolluted weather and haze.PM2.5 were mainly released from coal combustion and industry,secondary reaction,soil,motor vehicle and waste burnt during winter and spring.Contribution of secondary reaction was higher than other sources during haze,while contribution of soil was higher than others during dust.
【Fund】: 国家自然科学基金重点项目(51038001);; 国家环保部公益性行业科研专项(200909008);; 北京市科技新星计划B类项目(2009B07)
【CateGory Index】: X513
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