Physical and Chemical Characterization of Urban Grime During Wet and Dry Season : An Impact on the No2 Uptake Coefficients and Product Compounds
Urban grime represents an important environmental surface for heterogeneous reactions in urban environment. Here, we assess the physical and chemical properties of urban grime collected during six consecutive months in downtown of Guangzhou, China. There is a significant variation of the uptake coefficients of NO 2 on the urban grime as a function of the relative humidity (RH). In absence of water molecules (0% RH), the light-induced uptake coefficients of NO 2 on urban grime samples collected during six months are very similar in order of ≈10 -6 . At 80% RH, depending on the sampling month the light-induced uptake coefficient of NO 2 can reach one order of magnitude higher values (1.4 x 10 -5 , at 80% RH) compared to those uptakes at 0% RH. In presence of 80% RH, there are strong correlations between the measured NO 2 uptakes and the concentrations of the water soluble carbon, soluble anions, polycyclic aromatic hydrocarbons and n-alkanes depicted in the urban grime. These correlations, demonstrate that surface adsorbed water on urban grime play an important role for the uptakes of NO 2 . During the heterogeneous chemistry of NO 2 with urban grime, formation of unsaturated and N-containing organic compounds occur which can affect the air quality in urban environment
Year of publication: |
[2022]
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Authors: | Gligorovski, Sasho ; Liu, Jiangping ; Deng, Huifan ; Zhang, Ruiqi ; Li, Xue ; Luo, Yongming ; Wang, Xinming |
Publisher: |
[S.l.] : SSRN |
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