南京霾天气及PM_(2.5)化学污染特征分析  

Chemical Pollution Characteristics of PM_(2.5) in Haze Weather in Nanjing

作　　者：张海鸥[1,2] 周瑶瑶[1] 马嫣[1,2] 潘超[3] 孔春霞[1,2] 

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏南京210044 [2]江苏省大气环境监测与污染控制高技术重点实验室,江苏南京210044 [3]国电环境保护研究院,江苏南京210031

出　　处：《环境科学与技术》2015年第3期114-118,共5页Environmental Science & Technology

基　　金：国家自然基金(41030962;41275142);江苏高校优势学科建设工程项目资助

摘　　要：为了研究大气细粒子PM2.5在霾天气下的化学污染特性,2012年4月1日-27日在南京信息工程大学1号新实验楼楼顶,在霾天对大气细粒子PM2.5进行了采样,利用离子色谱法、TOC法等测得PM2.5的质量浓度、水溶性离子及水溶性有机碳组分浓度。结果表明:霾越重PM2.5质量浓度越高,霾天的PM2.5与地面温度、风速呈一定的负相关,与相对湿度呈正相关。SO42-、NO3-、NH4+、Ca2+、Na+、Cl-以及水溶性总有机碳是PM2.5的主要组成部分,其质量浓度随霾的加重而增加,其中NH4+、SO42-、NO3-及TOC质量浓度的增加幅度更明显,表明气态污染物的二次转化对采样点灰霾污染也有突出贡献。Airborne particles PM2.5 were sampled in haze weather from April 1 to April 27,2012 on the roof of a building;thereafter,the samples were analyzed by use of IC and TOC with respect of PM2.5 mass concentrations,the concentrations of water soluble and water-soluble organic carbon. The study showed that heavier the haze,higher the mass concentration of PM2.5,and that concentration of PM2.5 was negatively correlated with ground temperature and wind speed during haze days,while positively correlated with relative humidity. It was also found that PM2.5 mass concentration was mostly made up of SO42-,NO3-,NH4＋,Ca2＋,Na＋,Cl- and water-soluble organic carbon,which grew up as haze became heavier,among others,NH4＋,SO42-,NO3- and TOC increased much more,which suggested that the secondary transformation of gaseous pollutants had boosted the formation of haze.

关 键 词：霾 能见度 细粒子 水溶性离子 水溶性有机碳 

分 类 号：X513[环境科学与工程—环境工程]