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| DOI | 10.1016/j.atmosenv.2020.117327 |
| Characterization of water-insoluble oxidative potential of PM2.5 using the dithiothreitol assay | |
| Gao D.; Mulholland J.A.; Russell A.G.; Weber R.J. | |
| 发表日期 | 2020 |
| ISSN | 1352-2310 |
| 卷号 | 224 |
| 英文摘要 | 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 |
| 关键词 | Biomass burningOxidative potentialParticulate matterTransition metal ionsWater-insoluble componentsWater-soluble components |
| 语种 | 英语 |
| scopus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 |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/249301 |
| 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 |
| 推荐引用方式 GB/T 7714 | Gao D.,Mulholland J.A.,Russell A.G.,et al. Characterization of water-insoluble oxidative potential of PM2.5 using the dithiothreitol assay[J],2020,224. |
| APA | Gao D.,Mulholland J.A.,Russell A.G.,&Weber R.J..(2020).Characterization of water-insoluble oxidative potential of PM2.5 using the dithiothreitol assay.ATMOSPHERIC ENVIRONMENT,224. |
| MLA | Gao D.,et al."Characterization of water-insoluble oxidative potential of PM2.5 using the dithiothreitol assay".ATMOSPHERIC ENVIRONMENT 224(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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