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Characterization and source apportionment of carbonaceous aerosols in fine particles at urban and suburban atmospheres of Ankara, Turkey

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Abstract

In order to find the spatial distribution characteristics of elemental (EC) and organic (OC) carbon in fine particles, daily PM2.5 aerosol samples were collected at two different stations, between July 2014 and September 2015 in Ankara, Turkey. Concentrations of OC ranged from 2.1 to 42 μg m-3 at urban station. These concentrations were higher than those obtained for suburban station whose values ranged from 1.3 to 15 μg m-3. Concentrations of EC ranged from 0.7 to 4.9 μg m-3 at the urban station. As in OC case, the corresponding levels were higher than those measured for suburban station. The associated EC levels ranged from 0.1 to 3.4 μg m-3 for the suburban station. Daily changes in the levels of EC were larger than the OC levels. OC/EC ratios were lower with lower monthly variability in summer and higher with lower monthly variability in winter at the urban site. Medium and weak correlations were obtained between EC and OC in the winter and summer seasons, respectively, at both stations. Secondary organic carbon (SOC) was an important component of OC in PM2.5 at the urban and suburban sites. The winter SOC level was higher than the summer SOC level at the urban site but slightly lower than the summer SOC level at the suburban site. Total carbon was apportioned using factor analysis for the eight carbon fraction data (OC1, OC2, OC3, OC4, EC1, EC2, EC3, and OP). The main sources of pollutants in the urban and suburban settings were from vehicular emissions, biomass and coal combustions, and road dust.

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The datasets used and/or analyzed during the current study are available only for the authorized use.

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Acknowledgments

The authors would also like to the Dean of Faculty of Agriculture, Ankara University for their logistic support during field studies.

Funding

The authors would like to thank TUBITAK for the financial support of this study through project number 112Y036, 112Y037, and 115Y484.

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EK collected the samples, analyzed the data, and wrote the manuscript. SAK was the PI of project, who also revised the manuscript. FÖ analyzed the samples in terms of EC/OC, interpreted the data, and revised the manuscript. İİ proofread the manuscript. GT analyzed the data, proofread the manuscript, and read and approved the final manuscript.

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Correspondence to Ebru Koçak.

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The authors declare that they have no competing interests.

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Responsible Editor: Gerhard Lammel

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Koçak, E., Kılavuz, S.A., Öztürk, F. et al. Characterization and source apportionment of carbonaceous aerosols in fine particles at urban and suburban atmospheres of Ankara, Turkey. Environ Sci Pollut Res 28, 25701–25715 (2021). https://doi.org/10.1007/s11356-020-12295-6

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  • DOI: https://doi.org/10.1007/s11356-020-12295-6

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