globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2020.117327
论文题名:
Characterization of water-insoluble oxidative potential of PM2.5 using the dithiothreitol assay
作者: Gao D.; Mulholland J.A.; Russell A.G.; Weber R.J.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 224
语种: 英语
英文关键词: Metal ions ; Particles (particulate matter) ; Regression analysis ; Transition metal compounds ; Transition metals ; Ambient particulate Matter ; Antagonistic interactions ; Biomass burning emissions ; Biomass-burning ; Multivariate regression models ; Oxidative potential ; Particulate Matter ; Water soluble components ; Bromine compounds ; brown carbon ; carbon ; copper ; dithiothreitol ; metal ; unclassified drug ; water ; atmospheric pollution ; biomass burning ; brown carbon ; emission ; filter ; ion ; oxidation ; particle size ; particulate matter ; solubility ; transition element ; volume change ; Article ; assay ; biomass ; controlled study ; Georgia (U.S.) ; oxidation reduction potential ; particulate matter ; priority journal ; seasonal variation ; summer ; urban area ; volume ; winter ; Atlanta ; Georgia ; United States
学科: Biomass burning ; Oxidative potential ; Particulate matter ; Transition metal ions ; Water-insoluble components ; Water-soluble components
中文摘要: Both water-soluble and insoluble components of ambient particulate matter (PM) have been shown to contribute to the oxidative potential (OP) of PM. In this study, we used the dithiothreitol (DTT) assay to assess the water-soluble (OPWS−DTT) and total OP (OPtotal−DTT) of ambient fine particles (PM2.5), with water-insoluble OP (OPWI−DTT) determined by difference. Ambient PM2.5 filter samples were collected daily during 2017 in urban Atlanta and were analyzed for OP and major PM components. Results from measurements suggested a measurable contribution of water-insoluble components to OPDTT, which comprised on average 20% of total PM OP. Strong seasonal trends were observed in both volume- and mass-normalized OPtotal−DTT and OPWI−DTT, with higher values in the winter than in the summer, possibly driven by biomass burning emission seasonality. Correlation analysis indicated that all forms of OPDTT measurements were related to organic species and metals. OPtotal−DTT and OPWI−DTT were correlated with brown carbon (BrC) and total metals, especially total crustal elements. A multivariate regression model was developed for OPtotal−DTT based on particle composition data. The model suggested that the variability of OPtotal−DTT was primarily affected by BrC, followed by EC, total Cu and an antagonistic interaction between BrC and total Cu. © 2020
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160472
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作者单位: School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States

Recommended Citation:
Gao D.,Mulholland J.A.,Russell A.G.,et al. Characterization of water-insoluble oxidative potential of PM2.5 using the dithiothreitol assay[J]. Atmospheric Environment,2020-01-01,224
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