Characteristics of Organic and Elemental Carbon in PM2.5 and PM0.25 in Indoor and Outdoor Environments of a Middle School: Secondary Formation of Organic Carbon and Sources IdentificationReport as inadecuate




Characteristics of Organic and Elemental Carbon in PM2.5 and PM0.25 in Indoor and Outdoor Environments of a Middle School: Secondary Formation of Organic Carbon and Sources Identification - Download this document for free, or read online. Document in PDF available to download.

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Department of Environmental Science and Engineering, Xian Jiaotong University, Xian 710049, China

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Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xian 710061, China

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Laboratoire dAerologie, Observatory Midi-Pyrenees, CNRS—University of Toulouse, Toulouse 31400, France

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School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China

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School of Human Settlements and Civil Engineering, Xian Jiaotong University, Xian 710049, China

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Shaanxi Meteorological Bureau, Xian 710014, China

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Laboratory of Atmospheric Chemistry, Paul Scherrer Institute PSI, 5232 Villigen, Switzerland

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Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, Galway, Ireland

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Institute of Global Environmental Change, Xian Jiaotong University, Xian 710049, China





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Authors to whom correspondence should be addressed.



Academic Editors: Guohui Li and Robert W. Talbot

Abstract Secondary organic carbon SOC formation and its effects on human health require better understanding in Chinese megacities characterized by a severe particulate pollution and robust economic reform. This study investigated organic carbon OC and elemental carbon EC in PM2.5 and PM0.25 collected 8–20 March 2012. Samples were collected inside and outside a classroom in a middle school at Xi’an. On average, OC and EC accounted for 20%–30% of the particulate matter PM mass concentration. By applying the EC-tracer method, SOC’s contribution to OC in both PM size fractions was demonstrated. The observed changes in SOC:OC ratios can be attributed to variations in the primary production processes, the photochemical reactions, the intensity of free radicals, and the meteorological conditions. Total carbon TC source apportionment by formula derivation showed that coal combustion, motor vehicle exhaust, and secondary formation were the major sources of carbonaceous aerosol. Coal combustion appeared to be the largest contributor to TC 50%, followed by motor vehicle exhaust 25% and SOC 18% in both size fractions. View Full-Text

Keywords: OC and EC; SOC formation; very fine particles VFP; TC sources; indoor and outdoor; school; Xi’an; China OC and EC; SOC formation; very fine particles VFP; TC sources; indoor and outdoor; school; Xi’an; China





Author: Hongmei Xu 1,2,* , Benjamin Guinot 3, Zhenxing Shen 1, Kin Fai Ho 4, Xinyi Niu 2,5, Shun Xiao 2,6, Ru-Jin Huang 2,7,8 and Junji Cao 2,9,*

Source: http://mdpi.com/



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