AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Concentrations and Chemical Compositions of Size-resolved Particulate Matter in the Southwest of Pearl River Delta (PRD) Region
Yuanxun Zhang, DONGQING FANG, Yuqin Wang, Wei Huang, Reza Bashiri Khuzestani, Jing Shang, University of Chinese of Academy of Sciences
Abstract Number: 731 Working Group: Source Apportionment
Abstract The PRD region, one of the most economically developed areas in China, has long been suffered with severe air pollution which was probably caused by rapid population expansion and intense industrialization. To characterize the mass size distributions of chemical compositions, size-segregated samples were collected by 10-stage Micro-Orifice Uniform Deposit Impactor (MOUDI) at an Atmospheric Environment Monitoring Super-Station in Jiangmen city, Guangdong province during November, 2010. The samples were analyzed for gravimetric mass, water-soluble organic carbon (WSOC), water-soluble ions and elements. The average mass concentrations of coarse, fine and ultra-fine particles were 42.06±24.77 μg m−3, 90.6±11.46μg m−3 and 5.78±2.16 μg m−3, respectively. The dominant mass component in coarse particles was crustal materials, while the major component in fine and ultra-fine particles was organic matter, determined by chemical mass closure. Bimodal size distributions were found for particulate matter (PM), WSOC and NO3-, with their dominant mode at 0.32-0.56μm and plus a coarse mode at 1.8-3.2μm. While SO42- and NH4+ showed a unimodal size distribution at 0.32-0.56μm. The droplet mode was most prominent for Cl-, Na+ and K+. Mg2+ was more prominent in the coarse mode, whereas a single coarse mode was found for Ca2+. Most of size-resolve particle in HeShan tend to be weakly alkaline due to re-suspend road or crustal dust and sea salt while some fine particles was weakly acidic. The crustal elements, such as Al and Ti, were mainly distributed in coarse particles. Heavy metals (Cr, As and V) were mainly distributed in the fine particle fraction. The results of crustal enrichment factor (CEF) revealed that Ca, Na, Sm, Tb and Gd were from crustal source, and Zn, Pb, Mo, Tl and Ni from anthropogenic sources. Co, Mn and Rb in particles might be contributed by multi-sources. The results showed that the PM and relevant components mass concentrations had been reduced significantly compared with other studies conducted in PRD region. The emission control and prevention policies obtained a remarkable effect and significantly improved local air quality. In addition, more attention of local governments should be paid to the ship emissions which could increase PM concentration.