道路沥青中长寿命自由基特征及二次生成

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Abstract In this study, electron paramagnetic resonance (EPR) method was used to analysis the environmentally persistent free radicals EPFRs in road asphalt. It is found that the abundant EPFRs are present in the road asphalt, therefore it is speculated that road asphalt may be a potential source of EPFRs in road source atmospheric particles. This study was established to separate several components from asphalt by solvent extraction. The content and type distribution characteristics of EPFRs in different asphalt components were also studied. On the basis of this statement, the potential and characteristics of secondary EPFRs in road asphalt by photochemical reaction were explored. The results showed that the type of EPFRs in asphalt was a mixture of carbon centered and oxygen centered free radicals (g=2.0032~2.0038), mainly aromatic radicals and semiquinone radicals. The results also showed that 10%~20% of secondary EPFRs could be produced by asphalt after simulating sunlight irradiation, and it was found that the secondary EPFRs are mainly centered on oxygen atoms with larger g factor.

Key words： asphalt environmentally persistent free radicals (EPFRs) photochemical action characteristics

Received: 06 July 2020

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X131

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	Articles by authors
	LIN Hao
	LI Hao
	SUN Hao-yao
	CHEN Qing-cai

Cite this article:

LIN Hao,LI Hao,SUN Hao-yao等. Characteristics and secondary formation of EPFRs in road asphalt[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1102-1108.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1102

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