DOI: 10.1016/j.atmosenv.2017.12.004
Scopus记录号: 2-s2.0-85037686124
论文题名: Oxidative potential of ambient fine aerosol over a semi-urban site in the Indo-Gangetic Plain
作者: Patel A ; , Rastogi N
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 175 起始页码: 127
结束页码: 134
语种: 英语
英文关键词: Biomass burning
; Dithiothreitol
; Fossil fuel burning
; Reactive oxygen species
; Secondary organic aerosol
; Trace metals
Scopus关键词: Aerosols
; Agricultural wastes
; Air quality
; Atmospheric chemistry
; Fossil fuel power plants
; Fossil fuels
; Fuels
; Optical properties
; Organic carbon
; Particulate emissions
; Redox reactions
; Trace elements
; Biomass-burning
; Dithiothreitol
; Fossil fuel burning
; Reactive oxygen species
; Secondary organic aerosols
; Trace metal
; Urban growth
; dithiothreitol
; element
; fossil fuel
; organic carbon
; trace metal
; aerodynamics
; aerosol
; air quality
; ambient air
; atmospheric pollution
; biomass burning
; chemical compound
; concentration (composition)
; oxidation
; reactive oxygen species
; redox conditions
; trace metal
; urban area
; air quality
; ambient air
; Article
; biomass
; chemical composition
; concentration (parameters)
; fog
; molecular weight
; oxidation reduction potential
; particulate matter
; priority journal
; secondary organic aerosol
; urban area
; winter
; Gangetic Plain
; Sia
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: Indo-Gangetic Plain (IGP) receives emissions from variety of pollutant sources such as post-harvest crop residue burning, vehicles, industries, power plants, and bio-fuel burning. Several studies have documented physical, chemical and optical properties of aerosol over the IGP; however, their oxidative potential (OP) has not yet documented. Present study reports the OP (measured through dithiothreitol (DTT) assay) of soluble particulate matter smaller than 2.5 μm aerodynamic diameter (PM2.5) over Patiala (30.3°N, 76.4°E, 249 m amsl), a semi-urban site located in the IGP, during winter 2014. Volume-normalized OP (range: 1.3–7.2 nmol DTT min−1 m−3, average: 3.8 ± 1.4, 1σ) is found to be ∼3 to 20 times higher, and mass-normalized OP (range: 13-50 pmol DTT min−1 μg−1, average: 27 ± 8, 1σ) is found to be similar or higher than those documented in literature. Further, observed OP is found to depend more on PM2.5 composition rather than mass concentration. Mass fractions of organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon (WSOC) correlate positively whereas that of secondary inorganic aerosol (SIA, sum of the concentrations of SO4 2−, NO3 − and NH4 +) correlate negatively with OP μg−1 at considerable significance level (p < 0.05). Negative correlation of SIA with OP μg−1 has been assessed in laboratory experiment and attributed to their DTT inactive nature. It is suggested to use WSOC/SIA ratio as a measure of DTT activity of secondary particles over the study region. Further, biomass burning derived species are observed to be more DTT active than those derived from fossil fuel burning. It was also observed that the slope of OP μg−1 and WSOC/SIA ratio linear relationship enhances significantly in samples collected during days following foggy nights in comparison to that in samples collected during non-foggy period, which may be due to the production of redox-active species by fog processing. Such studies have implications in assessing the effect of ambient aerosol on atmospheric chemistry, air quality and human health. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83086
Appears in Collections: 气候变化事实与影响
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作者单位: Geosciences Division, Physical Research Laboratory, Ahmedabad, India
Recommended Citation:
Patel A,, Rastogi N. Oxidative potential of ambient fine aerosol over a semi-urban site in the Indo-Gangetic Plain[J]. Atmospheric Environment,2018-01-01,175