保定市冬季PM_(2.5)的氧化潜势特征及其影响来源分析  

Analysis on the Characteristics of Oxidation Potential and Influence Sources of PM_(2.5) in Baoding City in Winter

作　　者：吴继炎 杨池 张春燕 范美益[1,2] 吴爱坪 章炎麟 WU Ji-yan;YANG Chi;ZAHNG Chun-yan;FAN Mei-yi;WU Ai-ping;ZHANG Yan-lin(International Joint Laboratory on Climate and Environment Change(ILCEC),Yale-NUIST Center on Atmospheric Environment,School of Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学应用气象学院,耶鲁大学-南京信息工程大学大气环境中心,气候与环境变化国际合作联合实验室,南京210044 [2]南京信息工程大学气象灾害预报预警与评估协同创新中心,气象灾害教育部重点实验室,南京210044

出　　处：《环境科学》2022年第6期2878-2887,共10页Environmental Science

基　　金：国家自然科学基金项目(41977305);江苏省双创团队项目;江苏省杰出青年基金项目(BK20180040)。

摘　　要：为了探究保定市郊区2018年冬季PM_(2.5)氧化潜势的特征及其影响来源,利用二硫苏糖醇(DTT)测定法对PM_(2.5)中活性氧进行测定,采用皮尔逊相关分析PM_(2.5)中各化学成分与氧化潜势的关系,并且利用PMF对DTT_(v)进行污染源解析.结果表明,冬季保定市ρ(PM_(2.5))平均值为(140.96±70.67)μg·m^(-3),高于同时期北京PM_(2.5)浓度.氧化潜势的DTT_(v)和DTT_(m)值均表现出白天高于夜间的情况[DTT_(v)白天为(2.37±0.76)nmol·(min·m^(3))^(-1),夜间为(2.14±1.17)nmol·(min·m^(3))^(-1);DTT_(m)白天为(0.96±0.60)pmol·(min·μg)^(-1),夜间为(0.76±0.41)pmol·(min·μg)^(-1)].这表明白天的大气环境更有利于活性氧的生成和存活.另外,通过对DTT_(v)与糖类化合物、无机盐离子、OC、EC和水溶性金属等相关性分析,发现金属Fe、草酸根和NH_(4)^(+)与DTT_(v)在昼夜均存在较高相关性(白天:r=0.790,P<0.01,晚上:r=0.960,P<0.01;白天:r=0.609,P<0.01,晚上:r=0.577,P<0.01;白天:r=0.627,P<0.01,晚上r=0.586,P<0.01),另外OC、左旋葡聚糖、甘露聚糖和半乳聚糖仅仅在白天与DTT_(v)相关性较高(r=0.675,P<0.01;r=0.701,P<0.01;r=0.662,P<0.01;r=0.671,P<0.01).最后,利用PMF模型对DTT_(v)进行源解析,发现影响DTT_(v)的污染源主要有次生来源(29.9%)、生物质燃烧(29.2%)、扬尘(11.2%)、矿物粉尘和工业来源(8.6%)和交通源(21.1%)这5种,次生来源和生物质燃烧对DTT_(v)的影响占主要地位.In order to explore the characteristics of PM_(2.5)oxidation potential and its impact sources in the suburbs of Baoding City in the winter of 2018,the dithiothreitol(DTT)method was used to determine the reactive oxygen species in PM_(2.5).Pearson correlation was used to analyze the relationship between the chemical components in PM_(2.5)and the oxidation potential.PMF was used to analyze the pollution source of DTT_(v).Firstly,the results showed that the average value ofρ(PM_(2.5))in Baoding in winter was(140.96±70.67)μg·m^(-3)higher than the concentration of PM_(2.5)in Beijing during the same period.Secondly,both the DTT_(v) and DTT_(m) values of the oxidation potential were higher during the day than those at night[DTT_(v) was(2.37±0.76)nmol·(min·m^(3))^(-1) during the day and(2.14±1.17)nmol·(min·m^(3))^(-1) at night;DTT_(m) was(0.96±0.60)pmol·(min·μg)^(-1)during the day and(0.76±0.41)pmol·(min·μg)^(-1)at night].This showed that the atmospheric environment during the day was more conducive to the generation and survival of active oxygen.In addition,through the analysis of the correlation between DTT_(v) and carbohydrates,inorganic salt ions,OC,EC,and water-soluble metals,it was found that metal Fe,oxalate,and NH_(4)^(+) had a high correlation with DTT_(v) both day and night(during the day:r=0.790,P<0.01,at night:r=0.960,P<0.01;during the day:r=0.609,P<0.01,at night:r=0.577,P<0.01;during the day:r=0.627,P<0.01,at night:r=0.586,P<0.01),and OC,levoglucan,mannan,and galactan were only highly correlated with DTT_(v) in the daytime(r=0.675,P<0.01;r=0.701,P<0.01;r=0.662,P<0.01;r=0.671,P<0.01).Finally,according to the PMF source analysis,there were five main pollution sources that affected DTT_(v):secondary sources(29.9%),biomass combustion(29.2%),dust(11.2%),mineral dust and industrial sources(8.6%),and traffic sources(21.1%).The influence of secondary sources and biomass combustion on DTT_(v) was dominant.

关 键 词：大气颗粒物(PM_(2.5)) 氧化潜势(OP) 二硫苏糖醇(DTT) 活性氧(ROS) PMF源解析 

分 类 号：X513[环境科学与工程—环境工程]