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Characteristics of Organic Carbon( OC) and Elemental Carbon( EC)in PM2.5 in Winter in Xiamen City,China
Author(s): 
Pages: 336-341
Year: Issue:  3
Journal: Geology-Geochemistry

Keyword:  PM2.5organic carbon(OC)elemental carbon(EC)secondary organic carbon(SOC)pollution sourceXiamen City;
Abstract: In order to investigate the characteristics of carbon pollution in atmospheric PM2.5,PM2.5samples had been synchronously collected in urban and suburban areas of Xiamen City,China from December 10 th,2 014 to January 9th,2015.Concentrations of organic carbon( OC) and elemental carbon( EC) were analyzed by thermal optical transmission( TOT). Concentrations of OC,EC and PM2.5have showed a decreasing trend in recent years. The average OC concentrations in PM2.5of urban and suburban areas are 9. 77±1. 87 μg / m3 and 9. 17 ± 2. 42 μg / m3,respectively. And the average EC concentrations are 1. 87 ± 0. 73 μg/m3 and 2. 43 ±1. 10 μg / m3,respectively. Xiamen shows a lighter anthropogenic carbon pollution level with the comparative lower concentrations of OC and EC comparing with some domestic and foreign cities. However,OC / EC ratios of urban and suburban areas are higher than 2,and the SOC / OC ratios are 34. 96% and 39. 03%,respectively,suggesting that the secondary OC pollution in Xiamen City is serious.Distributions of PM2.5,OC and EC indicate that the concentrations of OC and EC in PM2.5are affected by not only weather conditions but also types of pollution sources,source strength and secondary pollution levels. The correlations between OC and EC in urban( R2=0. 107 9) and suburban( R2= 0. 341 9) areas are not significant,indicating that the sources of OC and EC in PM2.5are relatively complex. EC might mainly come from primary emission sources,such as fossil fuel and biomass incomplete combustion. OC is mainly influenced by the effects of fossil fuel burning and secondary pollution. In addition,sources of cooking and biomass burning have great contribution to urban areas.
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