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Atmosphere 2017, 8(4), 66; doi:10.3390/atmos8040066

Characterization of Atmospheric Iron Speciation and Acid Processing at Metropolitan Newark on the US East Coast

1,2,3,* and 3
1
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China
3
Department of Earth and Environmental Sciences, Rutgers University, Newark, NJ 07102, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Guey-Rong Sheu
Received: 7 March 2017 / Revised: 21 March 2017 / Accepted: 22 March 2017 / Published: 24 March 2017
(This article belongs to the Section Air Quality)
View Full-Text   |   Download PDF [2994 KB, uploaded 24 March 2017]   |  

Abstract

To characterize atmospheric dissolved iron over Newark, a large metropolitan city on US east coast, size-segregated (0.056–18 μm in aerodynamic diameter) aerosols were collected in downtown Newark, New Jersey during August to October 2012. Aerosols samples were analyzed for Fe(II) and total dissolved iron (Fe(TD)) by UV/Visible spectroscopy, and water soluble compounds were analyzed by ion chromatograph (IC). Results from this study showed that Fe(II) concentrations were 2.1 ng m−3 (range: 1.2–4.2 ng m−3), Fe(TD) concentrations were 2.4 ng m−3 (range: 1.3–4.9 ng m−3). Dissolved iron (Fe(II) and Fe(TD)) in general appeared as bi-modal size distribution, was mainly accumulated in the fine mode. The highest concentration of dissolved iron displayed in the fine mode, which was associated with high concentrations of sulfate, oxalate and nitrate, suggesting the potential for Fe–acids interactions. Dissolved iron presented positive correlations with sulfate in the coarse mode, and with nitrate in the fine mode, further suggesting the importance of acid processing in aerosol iron solubility. However, as the oxalate concentration was so low, a good correlation between dissolved iron and oxalate in both the fine and coarse mode was not found. View Full-Text
Keywords: iron speciation; particle size; water soluble compounds; acid processing iron speciation; particle size; water soluble compounds; acid processing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xu, G.; Gao, Y. Characterization of Atmospheric Iron Speciation and Acid Processing at Metropolitan Newark on the US East Coast. Atmosphere 2017, 8, 66.

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