Air quality
; Barium
; Brakes
; Carbon
; Electric current collection
; Manganese
; Pantographs
; Particles (particulate matter)
; Railroads
; Subways
; Toxicity
; Trace elements
; Airborne metals
; Chemical compositions
; Glutathiones
; Metallic trace elements
; Oxidative activity
; Oxidative potential
; Particulate Matter
; Subway systems
; Ascorbic acid
; ascorbic acid
; barium derivative
; carbon
; chromium derivative
; copper derivative
; glutathione
; iron derivative
; manganese derivative
; zinc derivative
; air quality
; air sampling
; ascorbic acid
; chemical composition
; concentration (composition)
; oxidative stress
; particulate matter
; pollutant source
; toxicity
; trace element
; ventilation
; Article
; chemical composition
; concentration (parameters)
; controlled study
; oxidation
; oxidation reduction potential
; particulate matter
; priority journal
; railway
; toxicology
; Barcelona [Catalonia]
; Catalonia
; Spain
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:
Air quality in subway systems is of interest not only because particulate matter (PM) concentrations can be high, but also because of the peculiarly metalliferous chemical character of the particles, most of which differ radically from those of outdoor ambient air. We report on the oxidative potential (OP) of PM2.5 samples collected in the Barcelona subway system in different types of stations. The PM chemical composition of these samples showed typically high concentrations of Fe, Total Carbon, Ba, Cu, Mn, Zn and Cr sourced from rail tracks, wheels, catenaries, brake pads and pantographs. Two toxicological indicators of oxidative activity, ascorbic acid (AA) oxidation (expressed as OPAA μg−1 or OPAA m−3) and glutathione (GSH) oxidation (expressed as OPGSH μg−1 or OPGSH m−3), showed low OP for all samples (compared with outdoor air) but considerable variation between stations (0.9–2.4 OPAA μg−1; 0.4–1.9 OPGSH μg−1). Results indicate that subway PM toxicity is not related to variations in PM2.5 concentrations produced by ventilation changes, tunnel works, or station design, but may be affected more by the presence of metallic trace elements such as Cu and Sb sourced from brakes and pantographs. The OP assays employed do not reveal toxic effects from the highly ferruginous component present in subway dust. � 2016 The Authors
Institute of Environmental Assessment and Water Research (ID�A-CSIC), C/Jordi Girona 18-24, Barcelona, Spain; MRC-PHE Centre for Environmental Health, King's College London, London, United Kingdom; Transports Metropolitans de Barcelona, Santa Eulalia, Av. del Metro s/n, L'Hospitalet de Llobregat, Barcelona, Spain
Recommended Citation:
Moreno T,, Kelly F,J,et al. Oxidative potential of subway PM2.5[J]. Atmospheric Environment,2017-01-01,148