Gerelmaa Gunchin This email address is being protected from spambots. You need JavaScript enabled to view it.1, Janos Osan2, Alessandro Migliori3, Dagva Shagjjamba4, Christina Streli1

1 Vienna University of Technology, Atominstitut, Vienna, Austria
2 Environmental Physics Department, Centre for Energy Research, Budapest, Hungary
3 Nuclear Science and Instrumentation Laboratory, Physics section, IAEA, Seibersdorf, Austria
4 Nuclear Research Center, National University of Mongolia, Ulaanbaatar, Mongolia


Received: January 29, 2021
Revised: April 29, 2021
Accepted: May 6, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.210018  

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Cite this article:

Gunchin, G., Osan, J., Migliori, A., Shagjjamba, D., Streli, C. (2021). Chromium and Zinc Speciation in Airborne Particulate Matter Collected in Ulaanbaatar, Mongolia, by X-Ray Absorption Near-edge Structure Spectroscopy. Aerosol Air Qual. Res. 21, 210018. https://doi.org/10.4209/aaqr.210018


HIGHLIGHTS

  • Chemical speciation of Cr and Zn characterized non-destructively in atmospheric PM.
  • Shallow angle SR-XANES performed on PM collected onto polycarbonate filters.
  • Speciation of Cr and Zn was not correlated with the concentrations of major elements.
  • Primary sources of both elements are mainly anthropogenic.
 

ABSTRACT


This study examined the chemical speciation of atmospheric particulate matter (PM) samples collected in Ulaanbaatar, Mongolia. The health effects of atmospheric aerosol depend on the particles’ size distribution, elemental composition and chemical species as well as other factors, which vary according to the pollution sources and meteorological conditions. Employing the International Atomic Energy Agency (IAEA) supported X-ray fluorescence (XRF) beamline at Elettra Sincrotrone Trieste, Italy, we used a small incidence angle for the synchrotron emission radiation in this ultra-high-vacuum environment to analyze the fine and the coarse mode (PM2.5 and PM2.5-10, respectively) through X-ray absorption near-edge structure (XANES) spectroscopy, which was applied to the K-edges of the chromium (Cr) and zinc (Zn) in PM samples selected via energy-dispersive XRF (EDXRF) analysis for their high concentrations of these transition metals. The spectroscopic results identified trivalent chromium sulfate [Cr2(SO4)3] and chromium oxide (Cr2O3) compounds as the major chemical forms of Cr in both the coarse and the fine PM fraction. Furthermore, both fractions contained abundances of sulfate (ZnSO4) and silicate (Zn2SiO4) compounds, but only the fine mode contained Zn oxalate (ZnC2O4), whereas only the coarse mode contained Zn chloride (ZnCl2). These Cr and Zn species seemed to originate from local anthropogenic sources, e.g., combustion products or traffic-related resuspended road dust.

Our findings, which are based on the first chemical speciation analysis from Ulaanbaatar, provide insight into the physiochemical characteristics of atmospheric aerosols as well as information on the potential sources of Cr and Zn species bound to fine and coarse PM.


Keywords: XANES, Cr and Zn speciation, Atmospheric PM, Ulaanbaatar




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