PM_(2.5)粉末样品中不同组分的氧化潜势及影响因素  

The contribution and influencing factors of different components to oxidation potential in PM_(2.5) powder samples

作　　者：彭勤 李丹 罗玉 彭泽志 孙健 Tomoaki Okuda 沈振兴[1] PENG Qin;LI Dan;LUO Yu;PENG Ze-zhi;SUN Jian;Tomoaki Okuda;SHEN Zhen-xing(Department of Environmental Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Faculty of Science and Technology,Keio University,3-14-1 Hiyoshi,Kohoku-ku,Yokohama,Kanagawa 223-8522,Japan)

机构地区：[1]西安交通大学环境科学与工程系,陕西西安710049 [2]庆应义塾大学科学技术学院,日本神奈川县横滨市,223-8522

出　　处：《中国环境科学》2024年第4期1957-1965,共9页China Environmental Science

基　　金：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)。

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.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.

关 键 词：PM_(2.5) 粉末样品 ROS 氧化潜势 氧化应激 化学组分 

分 类 号：X513[环境科学与工程—环境工程]