GSTDTAP  > 地球科学
DOI10.5194/acp-17-9965-2017
Dithiothreitol activity by particulate oxidizers of SOA produced from photooxidation of hydrocarbons under varied NOx levels
Jiang, Huanhuan; Jang, Myoseon; Yu, Zechen
2017-08-25
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2017
卷号17期号:16
文章类型Article
语种英语
国家USA
英文摘要

When hydrocarbons (HCs) are atmospherically oxidized, they form particulate oxidizers, including quinones, organic hydroperoxides, and peroxyacyl nitrates (PANs). These particulate oxidizers can modify cellular materials (e.g., proteins and enzymes) and adversely modulate cell functions. In this study, the contribution of particulate oxidizers in secondary organic aerosols (SOAs) to the oxidative potential was investigated. SOAs were generated from the photooxidation of toluene, 1,3,5-trimethylbenzene, isoprene, and alpha-pinene under varied NOx levels. Oxidative potential was determined from the typical mass-normalized consumption rate (reaction time t = 30 min) of dithiothreitol (DTTt), a surrogate for biological reducing agents. Under high-NOx conditions, the DTTt of toluene SOA was 2-5 times higher than that of the other types of SOA. Isoprene DTTt significantly decreased with increasing NOx (up to 69% reduction by changing the HC / NOx ratio from 30 to 5). The DTTt of 1,3,5-trimethylbenzene and alpha-pinene SOA was insensitive to NOx under the experimental conditions of this study. The significance of quinones to the oxidative potential of SOA was tested through the enhancement of DTT consumption in the presence of 2,4-dimethylimidazole, a co-catalyst for the redox cycling of quinones; however, no significant effect of 2,4-dimethylimidazole on modulation of DTT consumption was observed for all SOA, suggesting that a negligible amount of quinones was present in the SOA of this study. For toluene and isoprene, mass-normalized DTT consumption (DTTm) was determined over an extended period of reaction time (t = 2 h) to quantify their maximum capacity to consume DTT. The total quantities of PANs and organic hydroperoxides in toluene SOA and isoprene SOA were also measured using the Griess assay and the 4-nitrophenylboronic acid assay, respectively. Under the NOx conditions (HC / NOx ratio: 5-36 ppbC ppb(-1)) applied in this study, the amount of organic hydroperoxides was substantial, while PANs were found to be insignificant for both SOAs. Isoprene DTTm was almost exclusively attributable to organic hydroperoxides, while toluene DTTm was partially attributable to organic hydroperoxides. The DTT assay results of the model compound study suggested that electron-deficient alkenes, which are abundant in toluene SOA, could also modulate DTTm.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000408547700002
WOS关键词SECONDARY ORGANIC AEROSOL ; ELECTROPHILIC DISPLACEMENT-REACTIONS ; CONTROLLED CHEMICAL CONDITIONS ; ALPHA-PINENE PHOTOOXIDATION ; HYDROGEN-PEROXIDE ; OXIDATIVE STRESS ; AIR-POLLUTION ; ISOPRENE PHOTOOXIDATION ; PEROXYACETYL NITRATE ; BENZENEBORONIC ACID
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/30378
专题地球科学
作者单位Univ Florida, Engn Sch Sustainable Infrastruct & Environm, Dept Environm Engn Sci, Gainesville, FL 32608 USA
推荐引用方式
GB/T 7714
Jiang, Huanhuan,Jang, Myoseon,Yu, Zechen. Dithiothreitol activity by particulate oxidizers of SOA produced from photooxidation of hydrocarbons under varied NOx levels[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(16).
APA Jiang, Huanhuan,Jang, Myoseon,&Yu, Zechen.(2017).Dithiothreitol activity by particulate oxidizers of SOA produced from photooxidation of hydrocarbons under varied NOx levels.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(16).
MLA Jiang, Huanhuan,et al."Dithiothreitol activity by particulate oxidizers of SOA produced from photooxidation of hydrocarbons under varied NOx levels".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.16(2017).
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