[北京硫酸盐和硝酸盐的颗粒物粒径分布、存在形态及大气环境]

[Mass size distributions and existing forms of sulfate and nitrate and atmospheric environment in Beijing].

作者信息

Mao Hua-yun, Tian Gang, Huang Yu-hu, Li Gang, Song Guang-wu

机构信息

Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China.

出版信息

Huan Jing Ke Xue. 2011 May;32(5):1237-41.

PMID:21780574

Abstract

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 microm to 0.56 microm, 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)2SO4, NH4NO3, NaNO3, KNO3 and Ca(NO3)2. The mass concentration of secondary (NH4)2SO4 and NH4NO3 were (17.0 +/- 8.2) microg/m3 and (8.8 +/- 3.3) microg/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.

摘要

为了解北京PM10中二次硫酸盐和硝酸盐的形成情况及浓度。2008年5月至2009年4月，采用中流量采样器（MOUDI）在北京大气环境中采集PM10样品，并用离子色谱法分析PM10样品中的无机水溶性成分。结果表明，北京PM10中可溶性硫酸盐和硝酸盐的质量粒径分布为单峰分布，峰值范围为0.32微米至0.56微米，主要形成方式为气相化学反应。偏相关分析结果表明，北京PM10中硫酸盐和硝酸盐的主要形成物为硫酸铵[(NH4)2SO4]、硝酸铵(NH4NO3)、硝酸钠(NaNO3)、硝酸钾(KNO3)和硝酸钙[Ca(NO3)2]。二次硫酸铵[(NH4)2SO4]和硝酸铵(NH4NO3)的质量浓度分别为(17.0±8.2)微克/立方米和(8.8±3.3)微克/立方米，分别占PM10的(14.7±3.6)%和(7.6±2.2)%。它们的总和占PM10的(22.3±4.3)%。