Elemental composition of springtime aerosol in Chillán, Chile: Fid-Bau Portal

Elemental composition of springtime aerosol in Chillán, Chile

Carvacho, Omar F. / Trzepla-Nabaglo, Krystyna / Ashbaugh, Lowell L. / Flocchini, Robert G. / Melín, Pedro / Celis, José

AbstractAn aerosol monitoring study was established to measure ambient aerosol composition and study air pollution for one sampling site located at the University of Concepción, Chillán Campus. Chillán, a typical agricultural city in the central valley, is located in the southern Bio Bío Region of Chile. The Chillán Campus is located approximately 4km north of the city's downtown. The aerosol monitor operated on the campus from 9 October to 9 December, 1998. The study employed an IMPROVE sampler with an Anderson ${PM}_{10}$ inlet at 3m collecting ${PM}_{10}$ on 25mm Teflon membrane filters. The filters were weighed before and after sampling to obtain mass concentration, then proton induced X-ray emission and X-ray fluorescence analysis were used to measure the concentration of 22 elements to levels below $0.68 ng / m^{3}$ . Moderate aerosol concentration was observed (up to $116 μ g / m^{3}$ ). The main aerosol particle source in Chillán is resuspended soil dust, which accounts for 55% of the ${PM}_{10}$ aerosol. The presence of Br, Pb and V and other heavy metals in analyzed samples points to traffic emissions in the city. Aerosol associated with transportation activities accounts for 11% of the ${PM}_{10}$ mass. Non-transportation organics, associated with hydrogen measured by proton elastic scattering analysis, are an important component accounting for 19% of the ${PM}_{10}$ mass. Sulfate particles account for 3%. In addition, presence of several trace metals, including Mn, Zn, Cu, Ga, As, and Sr in our samples suggests the presence of industrial emissions in the city.