西安市PM<sub>2.5</sub>中环境持久性自由基污染特征

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Abstract

Environmentally persistent free radicals (EPFRs) are a new environmental risk substances with long half-life compared to traditional short-lived free radicals, which could convert O₂ molecules into reactive oxygen species and endanger human health. In order to the species, concentrations and sources of EPFRs in PM_2.5 in Xi'an in 2018, the electron paramagnetic resonance spectroscopy method was used to analyze EPFRs of the collected PM_2.5 samples. Results showed that the annual average atmospheric concentration of EPFRs in PM_2.5 in Xi'an was 2.16×10¹⁴ spins/m³ in 2018, with the range of 6.27×10¹²~1.07×10¹⁵ spins/m³. The seasonal variationsof EPFRs was highest in winter, following was autumn, summer and spring. According to the average annual concentration of EPFRs, the amount of EPFRs inhaled by people in Xi'an was equivalent to 7cigarettesper people per day, and as high as 35 cigarettes during haze days in winter. The annual average g factor of EPFRs in PM_2.5 of Xi'an was 2.0034±0.0002, indicating that it may be mainly carbon-center free radicals. Correlation results showed that EPFRs are significantly correlated with SO₂ and NO₂, indicating that coal combustion sources and transportation may be important of EPFRs in PM_2.5 in Xi'an.

Key words： PM_2.5 environmentally persistent free radicals (EPFRs) source seasonal variation

Received: 13 August 2019

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X513

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	LI Hao
	CHEN Qing-cai
	SUN Hao-yao

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LI Hao,CHEN Qing-cai,SUN Hao-yao. Study on pollution characteristics of environmentally persistent free radicals of PM_2.5 in Xi'an[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 967-974.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I3/967

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