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[Characterization and Variation of Organic Carbon (OC) and Elemental Carbon (EC) in PM During the Winter in the Yangtze River Delta Region, China].

Huan Jing Ke Xue; 39(3): 961-971, 2018 Mar 08.
Artigo em Chinês | MEDLINE | ID: mdl-29965438
Two hundred seventy-nine PM samples were collected from January 9, 2015 to January 31, 2015 in Lin'an, Nanjing, and Suzhou. They were analyzed for organic carbon (OC) and elemental carbon (EC) following the thermal/optical reflection protocol. The pollution characteristics of OC and EC in PM during the winter in the Yangtze River Delta were discussed in detail.The average mass concentrations of PM in the three sample sites were (123.56±61.11), (144.77±62.91), and (156.5±68.97) µg·m , respectively, which were in excess of the Ambient Air Quality Standard (GB 3095-2012) 24-hr mass-based standard of 75 µg·m . The average mass concentration of OC and EC were (21.93±11.69)/(6±3.6), (20.32±10.3)/(5.39±3.07), and (27.08±14.35)/(6.4±4.29) µg·m , respectively. Lin'an, which is regarded as the background site for the atmospheric environment in the Yangtze River Delta, is also polluted seriously. The OC was strongly correlated with EC in Lin'an ( =0.83), Nanjing ( =0.72), and Suzhou ( =0.72). This shows that the carbonaceous aerosols have similar sources during the winter in the Yangtze River Delta. All of the samples' OC/EC ratios exceeded 2.0, with the sample OC/EC ratios mainly distributed in the range of 2.5-6.0, indicating that coal combustion and vehicle exhaust are the main sources of OC and EC. The estimated mass concentrations of SOC were (9.23±5.26), (6.82±4.36), and (12.56±7.52) µg·m , respectively, which contributed 42%, 34%, and 46% to the OC, indicating that SOC is an important part of OC. Backward-trajectory shows that the mass concentrations of PM , OC, and EC have a good correlation with the transmission path of the main air mass. The mass concentrations of PM , OC, and EC controlled by the air mass from poor air quality areas are 1.14-1.7 times, 1.55-2.1 times, and 1.94-2.47 times higher than that in the air mass from good air quality areas.