The impact of HS radicals on the measured rate constant of H_2S with OH radicals  

作　　者：WANG HaiTao ZHU DongSheng WANG WeiPing MU YuJing 

机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

出　　处：《Chinese Science Bulletin》2010年第26期2951-2955,共5页

基　　金：supported by the National Natural Science Foundation of China (40830101,20977097 and 20677067);Chinese Academy of Sciences (KZCX2-YW-Q02-03);the National Water Special Project (2008ZX07421-001 and 2009ZX07210-009);the Platform Construction of Introducing Central Resources in Beijing (PXM2008-178305-06995);National Basic Research and Development Program (2010CB732304)

摘　　要：The rate constant for the reaction of OH radicals and hydrogen sulfide (H2S) was studied in different bath gases (including N2, air, O2 and He) by using relative technique at 298 K. The small difference of the measured rate constants between N2 and those with the presence of O2 suggested possible influence of HS self reaction. Further experiments with NOx presence for scavenging HS demonstrated this assumption. The rate constant of (5.48±0.12) ×10-12 cm3 molecule-1 s-1 obtained with 4.09 ×10-4 mol m3 NO presence may be accurate for estimating the atmospheric lifetime of H2S. The results provided circumstantial evidence that the rapid reaction of HS with N2O is suspected.The rate constant for the reaction of OH radicals and hydrogen sulfide （H2S） was studied in different bath gases （including N2, air, O2 and He） by using relative technique at 298 K. The small difference of the measured rate constants between N2 and those with the presence of O2 suggested possible influence of HS self reaction. Further experiments with NOx presence for scavenging HS demonstrated this assumption. The rate constant of （5.48±0.12） ×10^-12 cm^3 molecule^-1 s^-1 obtained with 4.09 ×10^-4 mol m^3 NO presence may be accurate for estimating the atmospheric lifetime of H2S. The results provided circumstantial evidence that the rapid reaction of HS with N2O is suspected.

关 键 词：OH自由基 速率常数 硫化氢 HS 氮氧化物 反应常数 可能影响 快速反应 

分 类 号：X511[环境科学与工程—环境工程] P402[天文地球—大气物理学与大气环境]