PM<sub>2.5</sub>粉末样品中不同组分的氧化潜势及影响因素

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Abstract Seasonal powder samples of PM_2.5 in Xi'an City were collected in this study based on the large flow cyclone impact sampler. By measuring the oxidative potential (OP) of water-soluble and water-insoluble phases, as well as the inorganic elements, water-soluble ions, carbon components, and organic functional groups in PM_2.5, the contribution of water-soluble/water-insoluble phases to OP were revealed and the impacts of chemical components on OP were discussed. The results showed that the total OP of PM_2.5 in Xi'an was significantly higher in autumn and winter (7.24 and 5.19µmol/(min·mg) in autumn and winter, respectively) than in spring and summer (2.06 and 3.15µmol/(min·mg) in spring and summer, respectively). The OP of PM_2.5 in spring and summer were mainly contributed by water-soluble phase (averagely 70.0%), instead of water-insoluble phase (averagely 73.9%) in autumn and winter. Water-soluble metals, especially heavy metals such as Ni, Pb, Ba, Mn, Cu and Ti, (0.60<R<0.80, P<0.05) and the water-soluble organic carbon (TOC) (R =0.54, P<0.05) showed strong correlations with water-soluble OP. Significant positive correlations between water-insoluble metals (Cu, Fe, Cr, etc.) and water-insoluble phase OP (0.48< R <0.71, P<0.05) were observed, while a significant negative correlation was found between water-insoluble EC and water-insoluble OP (-0.63< R <-0.45, P<0.05). The results of Fourier transform infrared spectroscopy showed that oxygenated water-soluble organics such as phenols, alcohols, ethers, esters, etc., should be responsible for the high OP of PM_2.5 samples.

Key words： PM_2.5 powder sample ROS oxidation potential oxidative stress chemical composition

Received: 21 September 2023

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X513

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	PENG Qin
	LI Dan
	LUO Yu
	PENG Ze-zhi
	SUN Jian
	Tomoaki Okuda
	SHEN Zhen-xing

Cite this article:

PENG Qin,LI Dan,LUO Yu等. The contribution and influencing factors of different components to oxidation potential in PM_2.5 powder samples[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 1957-1965.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I4/1957

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