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Volume 17, issue 3 | Copyright

Special issue: Pan-Eurasian Experiment (PEEX)

Atmos. Chem. Phys., 17, 2217-2227, 2017
https://doi.org/10.5194/acp-17-2217-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Feb 2017

Research article | 14 Feb 2017

Benzo[a]pyrene in urban environments of eastern Moscow: pollution levels and critical loads

Nikolay S. Kasimov, Natalia E. Kosheleva, Elena M. Nikiforova, and Dmitry V. Vlasov Nikolay S. Kasimov et al.
  • Department of Landscape Geochemistry and Soil Geography, Faculty of Geography, Lomonosov Moscow State University, Moscow 119991, Russia

Abstract. Polycyclic aromatic hydrocarbons (PAHs), particularly benzo[a]pyrene (BaP), are toxic compounds emitted from various anthropogenic sources. Understanding the BaP concentrations, dynamics and decomposition in soil is required to assess the critical loads of BaP in urban environments. This study is the first attempt to evaluate all major input and output components of benzo[a]pyrene (BaP) balance and to calculate the permissible load on the urban environment in different land-use zones in the Eastern district of Moscow. BaP contamination of the snow cover in the Eastern district of Moscow was related to daily BaP fallout from the atmosphere. In 2010, the mean content of the pollutant in the snow dust was 1942ngg−1, whereas the average intensity of its fallout was 7.13ngm−2 per day. Across the territory, BaP winter fallout intensities varied from 0.3 to 1100ngm−2 per day. The average BaP content in the surface (0–10cm) soil horizons was 409ngg−1, which is 83 times higher than the local background value and 20 times higher than the maximum permissible concentration (MPC) accepted in Russia. The variations in soil and snow BaP concentrations among different land-use zones were examined. A significant contribution of BaP from the atmosphere to urban soils was identified. Based on the measurements of BaP atmospheric fallout and BaP reserves in the soils, the critical loads of BaP for the land-use zones in the Eastern district were calculated for different values of degradation intensity and different exposure times. It was established that at an annual degradation intensity of 1–10%, ecologically safe BaP levels in the soils of all land-use zones, excluding the agricultural zone, will only be reached after many decades or centuries.

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Benzo[a]pyrene (BaP) is a toxic compound emitted from various anthropogenic sources. This study is the first attempt to evaluate all major input and output components of BaP balance in the land-use zones of the eastern district of Moscow. Based on measurements of BaP atmospheric fallout and reserves in the soils, the critical loads of BaP were calculated for different values of degradation intensity. Ecologically safe BaP levels in the soils will only be reached after many decades or centuries.
Benzo[a]pyrene (BaP) is a toxic compound emitted from various anthropogenic sources. This study...
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