DOI: 10.1016/j.atmosenv.2017.05.021
Scopus记录号: 2-s2.0-85019584146
论文题名: Influence of Saharan dust outbreaks and carbon content on oxidative potential of water-soluble fractions of PM2.5 and PM10
作者: Chirizzi D ; , Cesari D ; , Guascito M ; R ; , Dinoi A ; , Giotta L ; , Donateo A ; , Contini D
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 163 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: DTT assay
; Oxidative potential
; PM10
; PM2.5
; Saharan dust
Scopus关键词: Advection
; Dust
; Health
; Health risks
; Industrial emissions
; Organic carbon
; Roads and streets
; Urban growth
; Adverse health effects
; Atmospheric particulate matter
; Epidemiological studies
; Oxidative potential
; Reactive oxygen species
; Saharan dust
; Secondary organic carbon
; Water soluble fraction
; Particles (particulate matter)
; carbon
; organic carbon
; reactive oxygen metabolite
; anthropogenic source
; assay
; biomass burning
; carbon
; concentration (composition)
; dust
; health impact
; health risk
; Mediterranean environment
; oxidation
; particulate matter
; pollution exposure
; reactive oxygen species
; urban area
; aerosol
; Africa south of the Sahara
; Article
; autumn
; combustion
; comparative study
; dust
; health hazard
; Italy
; limit of detection
; optical density
; oxidation reduction potential
; particulate matter
; priority journal
; summer
; winter
; Italy
; Sahara
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: Exposure to atmospheric particulate matter (PM) leads to adverse health effects although the exact mechanisms of toxicity are still poorly understood. Several studies suggested that a large number of PM health effects could be due to the oxidative potential (OP) of ambient particles leading to high concentrations of reactive oxygen species (ROS). The contribution to OP of specific anthropogenic sources like road traffic, biomass burning, and industrial emissions has been investigated in several sites. However, information about the OP of natural sources are scarce and no data is available regarding the OP during Saharan dust outbreaks (SDO) in Mediterranean regions. This work uses the a-cellular DTT (dithiothreitol) assay to evaluate OP of the water-soluble fraction of PM2.5 and PM10 collected at an urban background site in Southern Italy. OP values in three groups of samples were compared: standard characterised by concentrations similar to the yearly averages; high carbon samples associated to combustion sources (mainly road traffic and biomass burning) and SDO events. DTT activity normalised by sampled air volume (DTTV), representative of personal exposure, and normalised by collected aerosol mass (DTTM), representing source-specific characteristics, were investigated. The DTTV is larger for high PM concentrations. DTTV is well correlated with secondary organic carbon concentration. An increased DTTV response was found for PM2.5 compared to the coarse fraction PM2.5-10. DTTV is larger for high carbon content samples but during SDO events is statistically comparable with that of standard samples. DTTM is larger for PM2.5 compared to PM10 and the relative difference between the two size fractions is maximised during SDO events. This indicates that Saharan dust advection is a natural source of particles having a lower specific OP with respect to the other sources acting on the area (for water-soluble fraction). OP should be taken into account in epidemiological studies to evaluate the potential health risks associated to ROS in regions affected by high pollution events due to Saharan dust advection. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82476
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Atmospheric Sciences and Climate, National Research Council, ISAC-CNR, Lecce, Italy; Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce, Italy
Recommended Citation:
Chirizzi D,, Cesari D,, Guascito M,et al. Influence of Saharan dust outbreaks and carbon content on oxidative potential of water-soluble fractions of PM2.5 and PM10[J]. Atmospheric Environment,2017-01-01,163