Measurements of HO2 uptake coefficient on aqueous（NH4）2SO4 aerosol using aerosol flow tube with LIF system  

作　　者：Qi Zou Huan Song Mingjin Tang Keding Lu 

机构地区：[1]College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China [2]State Key Laboratory of Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China

出　　处：《Chinese Chemical Letters》2019年第12期2236-2240,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China (Nos.91544225,21522701) for the financial support

摘　　要：Laboratory studies of HO2 uptake coefficients,γ(HO2),were conducted at room temperature using an aerosol flow tube coupled with a laser induced fluorescence(LIF) system.The measurement was conducted with atmospherically relevant HO2 concentrations(~1×10^9 molecule/cm^3) at 51% RH.The measured γ(HO2) onto aqueous(NH4)2 SO4 aerosol was 0.001±0.0007,which was consistent with the relatively low first-order loss rate of HO2 onto aqueous(NH4)2 SO4 aerosol.Theγ(HO2) was elevated with increase of Cu(Ⅱ) concentrations in aqueous(NH4)2 SO4 aerosol.The threshold of Cu(Ⅱ) concentration was10^-3 mol/L for the dramatic increase of γ(HO2).It was found that γ(HO2) reached 0.1 when Cu(Ⅱ)concentration in aerosol was larger than 10^-3 mol/L,suggesting that γ(HO2) is very sensitive to concentration of transition metal ions in aerosol.Laboratory studies of HO2 uptake coefficients,γ（HO2）,were conducted at room temperature using an aerosol flow tube coupled with a laser induced fluorescence（LIF） system.The measurement was conducted with atmospherically relevant HO2 concentrations（～1×109 molecule/cm3） at 51% RH.The measured γ（HO2） onto aqueous（NH4）2 SO4 aerosol was 0.001±0.0007,which was consistent with the relatively low first-order loss rate of HO2 onto aqueous（NH4）2 SO4 aerosol.Theγ（HO2） was elevated with increase of Cu（Ⅱ） concentrations in aqueous（NH4）2 SO4 aerosol.The threshold of Cu（Ⅱ） concentration was10-3 mol/L for the dramatic increase of γ（HO2）.It was found that γ（HO2） reached 0.1 when Cu（Ⅱ）concentration in aerosol was larger than 10-3 mol/L,suggesting that γ（HO2） is very sensitive to concentration of transition metal ions in aerosol.

关 键 词：Heterogeneous reaction HO2 uptake coefficient Aerosol flow tube Laser induced fluorescence Transition metal ion 

分 类 号：X701[环境科学与工程—环境工程]