TY - JOUR
T1 - Changes in oxidative potential of soil and fly ash after reaction with gaseous nitric acid
AU - Zhan, Ying
AU - Ginder-Vogel, Matthew
AU - Shafer, Martin M.
AU - Rudich, Yinon
AU - Pardo, Michal
AU - Katra, Itzhak
AU - Katoshevski, David
AU - Schauer, James J.
N1 - Funding Information:
This project was funded in part by the Israel-US Binational Science Foundation ( BSF- 2011178 ). We would also like to thank the staff at the Wisconsin State Laboratory of Hygiene for assistance with metal analysis and oxidative potential assays as well as Chris Worley for helping with experiment setup and analysis instrument maintenance.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - The goal of this study was to examine the impact of simulated atmospheric aging on the oxidative potential of inorganic aerosols comprised primarily of crustal materials. Four soil samples and one coal fly ash sample were artificially aged in the laboratory through exposure to the vapor from 15.8 M nitric acid solution for 24 h at room temperature. Native and acid-aged samples were analyzed with a cellular macrophage and acellular dithionthreitol assays to determine oxidative potential. Additionally, the samples were analyzed to determine the concentration of 50 elements, both total and the water-soluble fraction of these elements by Sector Field Inductively Coupled Plasma Mass Spectrometry (SF-ICMS) and crystalline mineral composition using X-ray Diffraction (XRD). The results show that reactions with gaseous nitric acid increase the water-soluble fraction of many elements, including calcium, iron, magnesium, zinc, and lead. The mineral composition analysis documented that calcium-rich minerals present in the soils (e.g., calcite) are converted into different chemical forms, such as calcium nitrate (Ca(NO3)2). The nitric acid aging process, which can occur in the atmosphere, leads to a 200–600% increase in oxidative potential, as measured by cellular and acellular assays. This laboratory study demonstrates that the toxic effects of aged versus freshly emitted atmospheric dust may be quite different. In addition, the results suggest that mineralogical analysis of atmospheric dust may be useful in understanding its degree of aging.
AB - The goal of this study was to examine the impact of simulated atmospheric aging on the oxidative potential of inorganic aerosols comprised primarily of crustal materials. Four soil samples and one coal fly ash sample were artificially aged in the laboratory through exposure to the vapor from 15.8 M nitric acid solution for 24 h at room temperature. Native and acid-aged samples were analyzed with a cellular macrophage and acellular dithionthreitol assays to determine oxidative potential. Additionally, the samples were analyzed to determine the concentration of 50 elements, both total and the water-soluble fraction of these elements by Sector Field Inductively Coupled Plasma Mass Spectrometry (SF-ICMS) and crystalline mineral composition using X-ray Diffraction (XRD). The results show that reactions with gaseous nitric acid increase the water-soluble fraction of many elements, including calcium, iron, magnesium, zinc, and lead. The mineral composition analysis documented that calcium-rich minerals present in the soils (e.g., calcite) are converted into different chemical forms, such as calcium nitrate (Ca(NO3)2). The nitric acid aging process, which can occur in the atmosphere, leads to a 200–600% increase in oxidative potential, as measured by cellular and acellular assays. This laboratory study demonstrates that the toxic effects of aged versus freshly emitted atmospheric dust may be quite different. In addition, the results suggest that mineralogical analysis of atmospheric dust may be useful in understanding its degree of aging.
KW - Acid aging
KW - Metals
KW - Mineral dust
KW - ROS activity
UR - http://www.scopus.com/inward/record.url?scp=85034669986&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2017.11.008
DO - 10.1016/j.atmosenv.2017.11.008
M3 - Article
AN - SCOPUS:85034669986
VL - 173
SP - 306
EP - 315
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
ER -