Source apportionment of trace elements in Ankara

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2014
Çelik, İlke
In this study, chemical composition of aerosol samples in Ankara is identified through receptor modeling. Within the scope of the study, 24-hr aerosol samples are collected by ‘Stack Filter Unit’ with using Nuclepore filter for 9 months at Middle East Technical University campus as a suburban sampling location. Collected filters are analyzed for fifty-seven major and minor trace elements, between z=3 Li and z = 92 (U) and black carbon. Measured concentrations of fine and coarse fractions are compared with corresponding concentrations reported for other cities around the world and Turkey, and also with performed in city of Ankara since 1975. As a result of these comparisons, average concentrations of elements are not significantly different from concentration reported in the literature, and both crustal and pollution derived elements are observed to be decreased significantly compared to1975 in Ankara. Coarse-to-fine ratio of the soil related elements are usually found higher than 1.0. In contrast, those of the anthropogenic elements are usually less than 1.0 with a few exceptions, including Cu, Ge, Zn Au, U and Li . Concentrations of the trace elements show short time and seasonal variations. These variations are explained according to changes in meteorological parameters and source strength. Positive matrix factorization (PMF) was used to identify source of elements and evaluate contribution of sources to each elements. This analysis indicates 6 sources; contaminated surface soil, a mixed crustal-anthropogenic factor, coal burning, traffic, road dust and subsurface soil.

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Citation Formats
İ. Çelik, “Source apportionment of trace elements in Ankara,” M.S. - Master of Science, Middle East Technical University, 2014.