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首页> 外文期刊>Atmospheric environment >Degradation of SO_2, NO_2 and NH3 leading to formation of secondary inorganic aerosols: An environmental chamber study
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Degradation of SO_2, NO_2 and NH3 leading to formation of secondary inorganic aerosols: An environmental chamber study

机译：SO_2，NO_2和NH3的降解导致形成二次无机气溶胶的环境室研究

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摘要

We have examined the interactions of gaseous pollutants and primary aerosols that can produce secondary inorganic aerosols. The specific objective was to estimate degradation rates of precursor gases (NH_3, NO_2 and SO_2) responsible for formation of secondary inorganic aerosols. A Teflon-based outdoor environmental chamber facility (volume 12.5 m~3) was built and checked for wall losses, leaks, solar transparency and ability to simulate photochemical reactions. The chamber was equipped with state-of-the-art instrumentation to monitor concentration-time profiles of precursor gases, ozone, and aerosol. A total of 14 experimental runs were carried out for estimating the degradation of precursor gases. The following initial conditions were maintained in the chamber: NO_2 = 246 ± 104 ppb(v), NH_3 = 548 ± 83 ppb(v), SO_2 = 238 ± 107 ppb(v), O_3 = 50 ± 11 ppb( v), PM2.5 aerosol = 283438 ± 60524 No./litre. The concentration-time profile of gases followed first-order decay and were used for estimating degradation rates (NO_2 = 0.26 ± 0.15 h-1, SO_2 = 0.31 ±0.17 h-1, NH3 = 0.35 ± 0.21 h-1). We observed that degradation rates showed a statistical significant positive correlation (at 5% level of significance) with the initial PM2.5 levels in the chamber (coefficient of correlation: 0.63 for NO2; 0.62 for NH3 and 0.51 for SO2), suggesting that the existing surface of the aerosol could play a significant role in degradation of precursor gases. One or more gaseous species can be adsorbed on to the existing particles and these may undergo heterogeneous or homogeneous chemical transformation to produce secondary inorganic aerosols. Through correlation analysis, we have observed that degradation rates of precursor gases were dependent on initial molar ratio of (NH3)/(NC>2 + SO2), indicative of ammonia-rich and ammonia-poor situations for eventual production of ammonium salts.
机译：我们已经检查了气态污染物和可产生次要无机气溶胶的主要气溶胶的相互作用。具体目标是估计负责形成二次无机气溶胶的前驱物气体（NH_3，NO_2和SO_2）的降解速率。建造了一个基于聚四氟乙烯的室外环境室设备（容积为12.5 m〜3），并检查了壁面损失，泄漏，日光透过性以及模拟光化学反应的能力。该室配备了最先进的仪器，可监测前体气体，臭氧和气溶胶的浓度-时间曲线。总共进行了14次实验运行，以估算前体气体的降解。腔室内保持以下初始条件：NO_2 = 246±104 ppb（v），NH_3 = 548±83 ppb（v），SO_2 = 238±107 ppb（v），O_3 = 50±11 ppb（v）， PM2.5喷雾= 283438±60524 No./L。气体的浓度-时间曲线遵循一阶衰减，并用于估算降解速率（NO_2 = 0.26±0.15 h-1，SO_2 = 0.31±0.17 h-1，NH3 = 0.35±0.21 h-1）。我们观察到降解率与室内的PM2.5初始水平呈统计学显着正相关（显着性水平为5％）（相关系数：NO2为0.63； NH3为0.62，SO2为0.51），表明气溶胶的现有表面可能在前体气体降解中起重要作用。一种或多种气态物质可以被吸附到现有的颗粒上，并且这些气态物质可能会经历异质​​或均质的化学转化，从而产生二次无机气溶胶。通过相关分析，我们发现前体气体的降解速率取决于（NH3）/（NC> 2 + SO2）的初始摩尔比，这表明最终生产铵盐时会出现富氨和贫氨的情况。

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