[Pollution characteristics of organic and elemental carbon in atmospheric particles in Nanjing northern suburb in summer].

To understand organic carbon (OC) and elemental carbon (EC) mass concentration, the particles samples were collected by an Andersen cascade impactor and analyzed with the DRI analyzer in Nanjing northern suburb during May to July in 2013. The results showed that the average mass concentrations of EC and OC in PM2.1 were (2.6 +/- 1.1) microg x m(-3), (13.0 +/- 5.2) microg x m(-3) and (3.4 +/- 1.7) microg x m(-3), (20.3 +/- 7.3) microg x m(-3) in PM90, respectively. EC was mainly enriched in ultrafine particles, and OC was mainly in fine particles. The ratios of PM1.1 (EC)/PM9.0 (EC) and PM2.1 (OC)/PM9.0 (OC) were 0.62 and 0.64, respectively. The average peak of concentration of both EC and OC appeared in 0.43 microm, accounting for 33.4% of TEC and 21.1% of TOC. EC and OC in PM1.1, PM2.1 and PM9.0 had a good relation during the summer in Nanjing northern suburb, suggesting that they shared the same source. Ratios of OC and EC indicated that the main origins of carbonaceous particles were attributed to automobile exhaust fumes, coal combustion and road dust.