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Effects of seed particles Al2O3, Al2(SO4)3 and H2SO4 on secondary organic aerosol |
Xiao Zhang1,2, Biwu Chu3, Junhua Li2(), Chaozhi Zhang1() |
1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China 2. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China 3. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China |
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Abstract • SO2/NH3 affected the role of seed particles in secondary aerosol (SA) formation. • Effects of seed particles on SA formation depended on their acid-base properties. • H2SO4 accelerated SA formation under either SO2 or NH3 condition.
![]() Seed particles Al2O3, Al2(SO4)3 and H2SO4 were selected to investigate their effects on secondary aerosol (SA) formation in toluene/NOx photooxidation under sulfur dioxide (SO2) and ammonia (NH3). Effect of seed particles on SA formation was related to their acid-base properties and the presence of acid or alkaline gases. Under NH3-poor condition, SA formation increased with increasing SO2 concentration due to the acid-catalyzing effect of the oxidation products of SO2 (i.e. H2SO4). The enhancing effect of SO2 became unobvious under NH3-rich condition, because NH3 would eliminate the acid-catalyzing effect by neutralizing the acid products. Acidic seeds H2SO4 accelerated SA formation under either SO2 or NH3 condition. Weak acidic Al2(SO4)3 seeds didn’t affect obviously on SA formation. The inhibiting effect of amphoteric seeds Al2O3 on SA formation was related to the presence of SO2 / NH3 due to their acid-base property. Under NH3-poor condition, the inhibiting effect of Al2O3 on SA formation decreased with increasing concentration of SO2, while under NH3-rich condition, the inhibiting effect wasn’t remarkable.
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Keywords
Seed particle
Secondary aerosol
Sulfur dioxide
Ammonia
Acid-catalyzing effect
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Corresponding Author(s):
Junhua Li,Chaozhi Zhang
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Issue Date: 26 April 2017
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