合肥市一次重污染过程细颗粒物的粒径分布特征及影响因素分析  

Analysis of particle size distribution characteristics and influencing factors of fine particles during a heavy pollution process in Hefei

作　　者：薛超 张红 笪春年[1] 汪水兵 秦志勇 包翔 XUE Chao;ZHANG Hong;DA Chunnian;WANG Shuibing;QIN Zhiyong;BAO Xiang(College of Biological Food&Environment,Hefei University,Hefei Anhui 230022;Anhui Academy of Eco-Environmental Sciences,Hefei Anhui 230071)

机构地区：[1]合肥学院生物食品与环境学院,安徽合肥230022 [2]安徽省生态环境科学研究院,安徽合肥230071

出　　处：《环境污染与防治》2022年第7期900-906,共7页Environmental Pollution & Control

基　　金：安徽省自然科学基金面上项目(No.2108085MD138);国家重点研发计划项目(No.2018YFC0213806);安徽省博士后研究基金资助项目(No.2021B548)。

摘　　要：利用单颗粒气溶胶质谱仪(SPAMS)采集的颗粒物数浓度和粒径数据,对合肥市2018年1月中下旬一次重污染过程中细颗粒物(PM_(2.5))粒径分布及数浓度的影响因素进行分析。结果表明:重污染过程分为污染积累、重污染、污染反弹和污染消散4个阶段,不同污染阶段颗粒物粒径分布特征不同,污染积累、重污染和反弹阶段的颗粒物粒径主要分布在0.5~1.5μm,污染消散阶段的颗粒物粒径主要分布在0.4~1.2μm;重污染过程中,气象因素和大气污染程度对颗粒物数浓度均有重要影响;气象因素方面,颗粒物数浓度与温度、太阳辐射强度呈正相关,与风速、气压呈负相关,与相对湿度不是单一的相关关系;大气污染方面,SO_(2)和NO_(2)质量浓度越高,颗粒物数浓度越高,而O_(3)质量浓度则与颗粒物数浓度呈负相关。In this study,the particle number concentration and size data collected by a single particle aerosol mass spectrometer(SPAMS)were used to analyze the influencing factors of particle size distribution and number concentration of fine particles(PM_(2.5))during a heavy pollution process in Hefei in mid-to-late January 2018.The results showed that the heavy pollution process was divided into four stages:pollution accumulation,heavy pollution,pollution rebound and pollution dissipation.The particle size distribution characteristics of different pollution stages were different.The particle size in the pollution accumulation stage,heavy pollution stage and pollution rebound stage was mainly distributed in 0.5-1.5μm,and the particle size in the pollution dissipation stage was mainly distributed in 0.4-1.2μm.During the heavy pollution process,meteorological factors and the degree of air pollution had an important influence on the particle number concentration.In terms of meteorological factors,the particle number concentration was positively correlated with temperature and solar radiation intensity,negatively correlated with wind speed and air pressure,and was not a single correlation with relative humidity.In terms of air pollution,the higher the mass concentration of SO_(2)and NO_(2),the higher the particle number concentration.O_(3) mass concentration had an inverse relationship with the particle number concentration.

关 键 词：PM2.5 颗粒物数浓度 粒径分布 影响因素 

分 类 号：X513[环境科学与工程—环境工程]