北京市大气环境中硫酸盐、硝酸盐粒径分布及存在形式  

Mass Size Distributions and Existing Forms of Sulfate and Nitrate at Atmospheric Environment in Beijing

作　　者：毛华云[1] 田刚[1] 黄玉虎[1] 李钢[1] 宋光武[1] 

机构地区：[1]北京市环境保护科学研究院,北京100037

出　　处：《环境科学》2011年第5期1237-1241,共5页Environmental Science

基　　金：国家环保公益性行业科研专项(200709030)

摘　　要：为了解北京市大气颗粒物中,二次硫酸盐、硝酸盐的存在形式及其含量,于2008年5月～2009年4月,利用MOUDI对北京市大气颗粒物分10级进行采样,利用离子色谱技术对各粒径范围大气颗粒物中的无机水溶性组分进行分析,并利用偏相关分析的方法确定其存在形式和估算其含量.结果表明,北京市大气颗粒物中水溶性硫酸盐和硝酸盐表现为单模态分布,峰值粒径分布在0.32～0.56μm,主要以气相转化为其主要形成途径;北京市大气PM10中,SO24-主要以(NH4)2SO4的形式存在,NO 3-则以NH4 NO3、NaNO3、KNO3和Ca(NO3)2等多种形式并存;北京市大气PM10中,二次(NH4)2 SO4和NH4 NO3的质量浓度分别为(17.0±8.2)μg/m3和(8.8±3.3)μg/m3,占PM10总量的(14.7±3.64)%和(7.6±2.2)%,二者之和占PM10总量的(22.3±4.3)%.In order to understand the formations and the concentrations of the secondary sulfate and nitrate of PM10 in Beijing.From May 2008 to April 2009,MOUDI has been used to collect the PM10 samples in Beijing atmospheric environment and the ion chromatography has been used to analyze the inorganic water-soluble components of the PM10 samples.The results showed that the mass size distributions of soluble sulfate and nitrate of PM10 in Beijing were single-mode distribution and the peak rang was from 0.32 μm to 0.56 μm,and the primary formation ways was the chemical reaction in the gas phase.The results of partial correlation analysis indicated that the primary formations of sulfate and nitrate of PM10 in Beijing was（NH4）2 SO4,NH4 NO3,NaNO3,KNO3 and Ca（NO3）2.The mass concentration of secondary（NH4）2 SO4 and NH4 NO3 were（17.0 ± 8.2） μg/m3 and（8.8 ± 3.3） μg/m3 respectively,which accounted for（14.7 ± 3.6）% and（7.6 ± 2.2）% of PM10 respectively.The sum of them accounted for（22.3 ± 4.3）% of PM10.

关 键 词：PM10 硫酸盐 硝酸盐 二次颗粒物 MOUDI 

分 类 号：X513[环境科学与工程—环境工程]