干旱区生态环境知识资源中心(Arid): Chemical Composition and Oxidative Potential of Atmospheric PM10 over the Arabian Sea

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DOI	10.1021/acsearthspacechem.9b00285
	Chemical Composition and Oxidative Potential of Atmospheric PM10 over the Arabian Sea
	Patel, Anil; Rastogi, Neeraj
通讯作者	Rastogi, Neeraj
来源期刊	ACS EARTH AND SPACE CHEMISTRY
ISSN	2472-3452
出版年	2020
卷号	4 期号:1 页码:112-121
英文摘要	The present study is the first report of the oxidative potential (OP) of atmospheric PM10 over marine environments. PM10 samples were collected onboard the Fishery Oceanographic Research Vessel Sagar Sampada (SS#359) over the Arabian Sea during April-May, 2017 and analyzed for a variety of chemical species and OPs. The PM10 mass concentration, volume-normalized OP [represented as nmol dithiothreitol (DTT) min(-1) m(-1) or OPv], and mass-normalized OP (represented as pmol DTT min(-1) mu g(-1) or OPM) over the study region varied from 61 to 184 mg m', 0.69 to 2.08 nmol DTT min(-1) m(-3), and 6 to 26 pmol DTT min(-1) mu g(-1), respectively. The study period was classified into two categories (Class-A and Class-B) based on 5-day air mass back trajectories for each sampling location. The mass fraction of mineral dust was similar to 2.5 times higher in Class-B samples (representing the Arabian Desert/marine air masses) in comparison with Class-A samples (representing the continental air mass). The average OPV and OPM associated with Class-A showed similar to 1.5 times higher values as compared to those associated with Class-B. Furthermore, Class-A samples showed similar to 95% Cl-1 depletion from sea salt aerosol, which was also found to be significantly correlated with OPM. These observations suggest the importance of free acidity not only in affecting the chemistry of marine atmosphere but also in catalytic generation of reactive oxygen species. Moreover, water-soluble organic nitrogen (WSON) contributes similar to 15% to total nitrogen, and the mass fraction of WSON was observed to be positively correlated (R = 0.79) with OPM suggesting that water-soluble (WS) nitrogenous organics are highly DTT-active. Further, OPM also exhibited a significant correlation (R = 0.83) with nss-K+, indicating the effect of biomass burning emissions on aerosol OP. In addition, the mass fraction of WS-Mn, WS-Cu, and WS-Zn also correlated significantly with OPM. Our results also infer that aerosol aging increases their OP. These results have important implications in assessing the effects of continental aerosol on marine atmospheric boundary layer and ocean biogeochemistry.
英文关键词	organic and elemental carbon water-soluble organic nitrogen water-soluble trace metals ROS DTT marine atmosphere
类型	Article
语种	英语
国家	India
收录类别	SCI-E
WOS记录号	WOS:000508474300011
WOS关键词	AIRBORNE PARTICULATE MATTER ; DITHIOTHREITOL DTT ; AMBIENT AEROSOL ; REDOX ACTIVITY ; FINE AEROSOL ; OXYGEN ; PARTICLES ; SITE ; BIOCHEMISTRY ; VARIABILITY
WOS类目	Chemistry, Multidisciplinary ; Geochemistry & Geophysics
WOS研究方向	Chemistry ; Geochemistry & Geophysics
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311984
作者单位	Phys Res Lab, Geosci Div, Ahmadabad 380009, Gujarat, India
推荐引用方式 GB/T 7714	Patel, Anil,Rastogi, Neeraj. Chemical Composition and Oxidative Potential of Atmospheric PM10 over the Arabian Sea[J],2020,4(1):112-121.
APA	Patel, Anil,&Rastogi, Neeraj.(2020).Chemical Composition and Oxidative Potential of Atmospheric PM10 over the Arabian Sea.ACS EARTH AND SPACE CHEMISTRY,4(1),112-121.
MLA	Patel, Anil,et al."Chemical Composition and Oxidative Potential of Atmospheric PM10 over the Arabian Sea".ACS EARTH AND SPACE CHEMISTRY 4.1(2020):112-121.