Long-life type - The dominant fraction of EPFRs in combustion sources and ambient fine particles in Xi'an

被引：36

作者：

Chen, Qingcai ^{[1
]}

Sun, Haoyao ^{[1
]}

Wang, Jin ^{[2
]}

Shan, Ming ^{[3
]}

Yang, Xudong ^{[3
]}

Deng, Mengsi ^{[3
]}

Wang, Yuqin ^{[1
]}

Zhang, Lixin ^{[1
]}

机构：

[1] Shaanxi Univ Sci & Technol, Sch Environm Sci & Engn, Weiyang Dist, Xian 710021, Shaanxi, Peoples R China

[2] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

[3] Tsinghua Univ, Sch Architecture, Dept Bldg Sci, Beijing 100084, Peoples R China

来源：

ATMOSPHERIC ENVIRONMENT | 2019年 / 219卷

基金：

中国国家自然科学基金;

关键词：

PM2.5; EPFRs; Long life; Sources; Formation mechanism; PERSISTENT FREE-RADICALS; PM2.5; STABILIZATION; LIFETIMES;

D O I：

10.1016/j.atmosenv.2019.117059

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Environmentally persistent free radicals (EPFRs) are new environmental health risk substances that have received much attention in recent years. The characterization of EPFR5 is essential for understanding their sources and formation mechanisms in atmospheric particulate matter (PM), yet their physicochemical characteristics have not yet been fully and extensively studied. To clarify the nature of "persistent" free radicals in atmospheric PM, we systematically evaluated the decay characteristics of EPFRs in both combustion sources and ambient PM2.5 based on the planned measurement of EPFRs in a large number of samples (more than 130). The content of EPFRs changed over time for up to 2 years. This study quantifies EPFRs with different lifetimes in different sources of PM2.5. The results indicate that the EPFRs were dominated by the long-life type (>70%), with a 1/e lifetime of several years, in both combustion sources and ambient PM2.5. The decay characteristics of the EPFRs, including the temporal variations in the concentrations and g-factors of EPFRs in ambient PM2.5, were similar to those of combustion source samples but different from those of EPFRs produced by the interaction of metal oxides and aromatics. The interaction of metal oxides and aromatics may produce short-life EPFRs, and the formation mechanism of long-life EPFRs may be more complicated. This study provides important basic knowledge for understanding the sources and formation mechanisms of EPFRs in atmospheric PM.

引用

页数：5

共 32 条

[1]

[Anonymous], 2012, ENV SCI TECHNOL, DOI [DOI 10.1021/ES300362K, DOI 10.1021/es300362k]

[2] Quantification of environmentally persistent free radicals and reactive oxygen species in atmospheric aerosol particles [J].

Arangio, Andrea M. ;

Tong, Haijie ;

Socorro, Joanna ;

Poschl, Ulrich ;

Shiraiwa, Manabu .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2016, 16 (20) :13105-13119

[3] Lack of correlation between cigarette mainstream smoke particulate phase radicals and hydroquinone yield [J].

Blakley, RL ;

Henry, DD ;

Smith, CJ .

FOOD AND CHEMICAL TOXICOLOGY, 2001, 39 (04) :401-406

[4] Environmentally Persistent Free Radical (EPFR) Formation by Visible-Light Illumination of the Organic Matter in Atmospheric Particles [J].

Chen, Qingcai ;

Sun, Haoyao ;

Wang, Mamin ;

Wang, Yuqin ;

Zhang, Lixin ;

Han, Yuemei .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2019, 53 (17) :10053-10061

[5] Characteristics of environmentally persistent free radicals in PM2.5: Concentrations, species and sources in Xi'an, Northwestern China [J].

Chen, Qingcai ;

Sun, Haoyao ;

Mu, Zhen ;

Wang, Yuqin ;

Li, Yanguang ;

Zhang, Lixin ;

Wang, Mamin ;

Zhang, Zimeng .

ENVIRONMENTAL POLLUTION, 2019, 247 :18-26

[6] Dominant Fraction of EPFRs from Nonsolvent-Extractable Organic Matter in Fine Particulates over Xi'an, China [J].

Chen, Qingcai ;

Sun, Haoyao ;

Wang, Mamin ;

Mu, Zhen ;

Wang, Yuqin ;

Li, Yanguang ;

Wang, Yansong ;

Zhang, Lixin ;

Zhang, Zimeng .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2018, 52 (17) :9646-9655

[7] Rapid determination of environmentally persistent free radicals (EPFRs) in atmospheric particles with a quartz sheet-based approach using electron paramagnetic resonance (EPR) spectroscopy [J].

Chen, Qingcai ;

Wang, Mamin ;

Wang, Yuqin ;

Zhang, Lixin ;

Xue, Jian ;

Sun, Haoyao ;

Mu, Zhen .

ATMOSPHERIC ENVIRONMENT, 2018, 184 :140-145

[8] Origin and health impacts of emissions of toxic by-products and fine particles from combustion and thermal treatment of hazardous wastes and materials [J].

Cormier, Stephania A. ;

Lomnicki, Slawo ;

Backes, Wayne ;

Dellinger, Barry .

ENVIRONMENTAL HEALTH PERSPECTIVES, 2006, 114 (06) :810-817

[9] Experimental and Theoretical Investigation on the Catalytic Generation of Environmentally Persistent Free Radicals from Benzene [J].

D'Arienzo, Massimiliano ;

Gamba, Livio ;

Morazzoni, Franca ;

Cosentino, Ugo ;

Greco, Claudio ;

Lasagni, Marina ;

Pitea, Demetrio ;

Moro, Giorgio ;

Cepek, Cinzia ;

Butera, Valeria ;

Sicilia, Emilia ;

Russo, Nino ;

Munoz-Garcia, Ana B. ;

Pavone, Michele .

JOURNAL OF PHYSICAL CHEMISTRY C, 2017, 121 (17) :9381-9393

[10] Role of free radicals in the toxicity of airborne fine particulate matter [J].

Dellinger, B ;

Pryor, WA ;

Cueto, R ;

Squadrito, GL ;

Hegde, V ;

Deutsch, WA .

CHEMICAL RESEARCH IN TOXICOLOGY, 2001, 14 (10) :1371-1377

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