RESUMO
Potential pollution sources of atmospheric PM2.5 in Nanjing region were collected, and sulfur and carbon isotopic compositions were determined by EA-IRMS synchronously. The results showed that δ³4S and δ¹³C values ranged from 1.8-3.7 and -25.50- -23.57 in coal soot particles; 4.6-9.7 and -26.32- -23.57 in vehicle exhaust; 5.2-9.9 and -19.30- -30.42 in straw soot particles, respectively. Besides, the δ¹³C value of dust was -13.45. It can be observed that sulfur isotopic compositions in coal soot were lower, while the carbon isotopic composition in dust was higher. Comparing with δ³4S and δ¹³C values in domestic and foreign polluted sources, we found that sulfur and carbon isotopes in atmospheric PM2.5 in Nanjing region presented an obvious regional characteristics. Therefore, the source spectrum of sulfur and carbon isotopic compositions in Nanjing region might provide an insight into source apportionment of atmospheric PM2.5.
Assuntos
Poluentes Atmosféricos/análise , Isótopos de Carbono/análise , Monitoramento Ambiental , Isótopos de Enxofre/análise , Carbono , China , Carvão Mineral , Poeira , Poluição Ambiental , Material Particulado , Fuligem , Enxofre , Emissões de VeículosRESUMO
The concentrations of OC and EC in PM1.1 collected from Nanshi (NS) and Nanhua (NH) in 2011 were analyzed using DRI Model 2001A Thermal Optical Carbon Analyzer. In addition, source apportionment was simultaneously evaluated. The results showed that the annual average concentrations of OC and EC in PM1.1 were 10. 10 µg x m(-3) and 2.52 µg x m(-3) in NS area, and 11.22 µg x m(-3) and 3.12 µg x m(-3) in NH area, respectively. This result indicated that OC and EC pollution in NH was more serious than that in NS area. Meanwhile, the concentrations of OC and EC in winter and spring were obviously higher compared to those in summer in these two sampling sites, which was mainly ascribed to the increased coal combustion and the unfavorable emission condition of air pollutants in summer and spring. We noted that the SOC/TOC value was the highest in summer and the lowest in winter. In addition, the SOC concentration was observed to show a positive correlation with ozone concentrations, which indicated that the photochemical reaction was a main way of SOC formation in autumn.