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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摘要基于大流量旋风式冲击采样器在西安市采集了四季大气PM_2.5粉末样品,分别测定其水溶和非水溶相的氧化潜势(OP)、无机元素、水溶性离子、金属组分、碳组分和有机官能团,揭示水溶相/非水溶相的化学组分对OP的影响.结果显示,西安市PM_2.5粉末样品总OP的趋势为秋冬(秋7.24µmol/(min·mg),冬5.19µmol/(min·mg))显著高于春夏季(春2.06µmol/(min·mg),夏3.15µmol/(min·mg));春夏季PM_2.5粉末样品的OP以水溶相OP为主(70.0%),秋冬季以非水溶相为主(73.9%).水溶性金属Ni、Pb、Ba、Mn、Cu、Ti(0.60< R <0.80, P<0.05)和水溶性有机碳(TOC)(R=0.54, P<0.05)与水溶相OP呈较显著的正相关.非水溶性金属(Cu、Fe、Cr等)与非水溶相OP普遍呈较显著的正相关(0.48< R <0.71, P<0.05),非水溶性元素碳(EC)与非水溶相OP则呈显著负相关(-0.63< R <-0.45, P<0.05).傅里叶红外光谱的结果显示,酚、醇、醚、酯等含氧水溶性有机物对PM_2.5粉末样品中水溶相OP有重要的影响.

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	彭勤
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	罗玉
	彭泽志
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	Tomoaki Okuda
	沈振兴

关键词 ： PM_2.5, 粉末样品, ROS, 氧化潜势, 氧化应激, 化学组分

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

收稿日期: 2023-09-21

PACS:

X513

基金资助:陕西省重点研发项目(2022ZDLSF06-07);中国博士后自然科学基金资助项目(2021M692549);中央高校基本科研业务费资助项目(xjh012020024)

通讯作者: 孙健,副教授,sunjian0306@xjtu.edu.cn E-mail: sunjian0306@xjtu.edu.cn

引用本文:

彭勤, 李丹, 罗玉, 彭泽志, 孙健, Tomoaki Okuda, 沈振兴. PM_2.5粉末样品中不同组分的氧化潜势及影响因素[J]. 中国环境科学, 2024, 44(4): 1957-1965. PENG Qin, LI Dan, LUO Yu, PENG Ze-zhi, SUN Jian, Tomoaki Okuda, SHEN Zhen-xing. The contribution and influencing factors of different components to oxidation potential in PM_2.5 powder samples. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 1957-1965.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I4/1957

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