During 2005, the filter samples of ambient PM10 from five sites and the source samples of particulate matter were collected in Kaifeng, Henan Province of China. Nineteen elements, water-soluble ions, total carbon （TC...During 2005, the filter samples of ambient PM10 from five sites and the source samples of particulate matter were collected in Kaifeng, Henan Province of China. Nineteen elements, water-soluble ions, total carbon （TC） and organic carbon （OC） contained in samples were analyzed. Seven contributive source types were identified and their contributions to ambient PM10 were estimated by chemical mass balance （CMB） receptor model. Weak associations between the concentrations of organic carbon and element carbon （EC） were observed during the sampling periods, indicating that there was secondary organic aerosol pollution in the urban atmosphere. An indirect method of ＂OC/EC minimum ratio＂ was applied to estimate the concentration of secondary organic carbon （SOC）. The results showed that SOC contributed 26.2%, 32.4% and 18.0% of TC in spring, summer-fall and winter, respectively, and the annual average SOC concentration was 7.07 μg/m^3, accounting for 5.73% of the total mass in ambient PM10. The carbon species concentrations in ambient PM10 were recalculated by subtracting SOC concentrations from measured concentrations of TC and OC to increase the compatibility of source and receptor measurements for CMB model.展开更多
Organic carbon(OC),element carbon(EC)and 8 car-bon fractions(OC1,OC2,OC3,OC4,EC1,EC2,EC3 and py rolytic carbon(OP))in PM2.s samples collected in Tianjin ur-ban area during January to April,2014 were analyzed with ther...Organic carbon(OC),element carbon(EC)and 8 car-bon fractions(OC1,OC2,OC3,OC4,EC1,EC2,EC3 and py rolytic carbon(OP))in PM2.s samples collected in Tianjin ur-ban area during January to April,2014 were analyzed with thermal light reflection method.The result showed that the concentrations of OC and EC in PM2.s were(18.7±9.9),(3.9±2.6)μg/m3,respectively,which accounting for 18.0 of PM2.s mass concentrations.Temporal variability of OC and EC was consistent,they were higher in the spring festival and heating season,and lower in the non heating season.The cor relation of carbon fractions were analyzed by SPSS 20.0,which illustrating the tight relationship between OC1-OC4 and ECI EC3,and suggesting that these constituents were derived from the same primary emission source or they were influenced by similar secondary processes in the atmosphere.The principal component analysis(PCA)showed that coal combus-tion,biomass burning and motor vehicle exhaust were three main sources of OC and EC in PM2.5 in Tianjin urban area.展开更多
基金supported by the National Technology Supporting, Kaifeng Environmental Protec-tion Bureau, Henan Province, China
文摘During 2005, the filter samples of ambient PM10 from five sites and the source samples of particulate matter were collected in Kaifeng, Henan Province of China. Nineteen elements, water-soluble ions, total carbon （TC） and organic carbon （OC） contained in samples were analyzed. Seven contributive source types were identified and their contributions to ambient PM10 were estimated by chemical mass balance （CMB） receptor model. Weak associations between the concentrations of organic carbon and element carbon （EC） were observed during the sampling periods, indicating that there was secondary organic aerosol pollution in the urban atmosphere. An indirect method of ＂OC/EC minimum ratio＂ was applied to estimate the concentration of secondary organic carbon （SOC）. The results showed that SOC contributed 26.2%, 32.4% and 18.0% of TC in spring, summer-fall and winter, respectively, and the annual average SOC concentration was 7.07 μg/m^3, accounting for 5.73% of the total mass in ambient PM10. The carbon species concentrations in ambient PM10 were recalculated by subtracting SOC concentrations from measured concentrations of TC and OC to increase the compatibility of source and receptor measurements for CMB model.
文摘Organic carbon(OC),element carbon(EC)and 8 car-bon fractions(OC1,OC2,OC3,OC4,EC1,EC2,EC3 and py rolytic carbon(OP))in PM2.s samples collected in Tianjin ur-ban area during January to April,2014 were analyzed with thermal light reflection method.The result showed that the concentrations of OC and EC in PM2.s were(18.7±9.9),(3.9±2.6)μg/m3,respectively,which accounting for 18.0 of PM2.s mass concentrations.Temporal variability of OC and EC was consistent,they were higher in the spring festival and heating season,and lower in the non heating season.The cor relation of carbon fractions were analyzed by SPSS 20.0,which illustrating the tight relationship between OC1-OC4 and ECI EC3,and suggesting that these constituents were derived from the same primary emission source or they were influenced by similar secondary processes in the atmosphere.The principal component analysis(PCA)showed that coal combus-tion,biomass burning and motor vehicle exhaust were three main sources of OC and EC in PM2.5 in Tianjin urban area.
