DOI: 10.1016/j.atmosenv.2017.06.044
Scopus记录号: 2-s2.0-85021625914
论文题名: Oxidative potential of PM2.5 during Atlanta rush hour: Measurements of in-vehicle dithiothreitol (DTT) activity
作者: Vreeland H ; , Weber R ; , Bergin M ; , Greenwald R ; , Golan R ; , Russell A ; G ; , Verma V ; , Sarnat J ; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 165 起始页码: 169
结束页码: 178
语种: 英语
英文关键词: DTT assay
; In-vehicle
; Oxidative potential
; Particulate matter
; Semivolatiles
; Traffic emissions
Scopus关键词: Carbon
; Organic carbon
; Pollution
; Transportation
; Vehicles
; Oxidative potential
; Particulate Matter
; Particulate pollution
; Roadside monitoring
; Semivolatiles
; Traffic emissions
; Water-soluble organic carbon
; Water-soluble species
; Gas emissions
; dithiothreitol
; organic carbon
; silicon dioxide
; ambient air
; assay
; atmospheric pollution
; measurement method
; oxidation
; particulate matter
; pollution monitoring
; redox potential
; sampling
; traffic emission
; volatile organic compound
; air pollution
; Article
; assay
; environment
; gas
; measurement
; monitoring
; oxidation reduction potential
; particulate matter
; priority journal
; Atlanta
; Georgia
; United States
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Although exposure to traffic emissions is frequently associated with negative health impacts, few studies have measured air pollution directly in-vehicle, and limited measurements of daily commuter exposure exist. This research, part of the Atlanta Commuter Exposures (ACE) Study, assesses on-roadway in-cabin particulate pollution (PM2.5) collected from scripted rush hour commutes on highways and on non-highway side streets. Water-soluble extracts from PM2.5 filters were analyzed for oxidative potential of water-soluble species using the dithiothreitol (DTT) assay, and results suggest that there may be substantial gas-phase DTT activity in fresh emissions. We measured DTTv activities (i.e., DTT activity normalized to the sampled air volume) that were on average two times higher than comparable measurements collected by stationary roadside monitoring sites. Although some of this difference may be attributable to positive artifacts due to relatively brief (2-h) quartz filter sampling durations, the current findings provide some indication that commuters encounter notably higher exposure to redox-active PM2.5 in the on-road environment. Strong correlations are observed between water-soluble DTT activity and water-soluble organic carbon (WSOC), specifically for the ‘semivolatile’ WSOC component (measured as the difference between denuded and non-denuded filters). Although potential for artifacts when measuring DTT activity of fresh emissions using filter-based methods is considerable, these results suggest that semivolatile organic species are important contributors to DTT activity, at least in environments where ambient PM2.5 is dominated by vehicular sources. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82395
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Duke University, 123 Hudson Hall, Durham, NC, United States; School of Earth and Atmospheric Science, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA, United States; School of Public Health, Georgia State University, 1 Park Place, Suite 714, Atlanta, GA, United States; Department of Environmental Health, Rollins School of Public Health, Emory University, 1518 Clifton Road, Room 260, Atlanta, GA, United States; Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel; School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA, United States; Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
Recommended Citation:
Vreeland H,, Weber R,, Bergin M,et al. Oxidative potential of PM2.5 during Atlanta rush hour: Measurements of in-vehicle dithiothreitol (DTT) activity[J]. Atmospheric Environment,2017-01-01,165