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首页> 外文期刊>Physical chemistry chemical physics: PCCP >The heterogeneous kinetics of HOBr and HOCl on acidified sea salt and model aerosol at 40-90% relative humidity and ambient temperature
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The heterogeneous kinetics of HOBr and HOCl on acidified sea salt and model aerosol at 40-90% relative humidity and ambient temperature

机译：在40-90％相对湿度和环境温度下，HOBr和HOCl在酸化海盐和模型气溶胶上的非均相动力学

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摘要

The HOBr and HOCl uptake coefficient gamma on H2SO4-acidified submicron salt aerosol of known size distribution was measured in an atmospheric pressure laminar flow reactor. The interaction time of the trace gas with the aerosol was in the range 15 to 90 s and led to gamma values in the range 10(-4) to 10(-2). The acidity of the aerosol is essential in order to enable heterogeneous reactions of HOBr on NaCl, recrystallized sea salt (RSS) and natural sea salt (NSS) aerosols. Specifically, HOCl only reacts on acidified NSS aerosol with a gamma ranging from 0.4 x 10(-3) to 1.8 x 10(-3) at a relative humidity (rh) at 40 and 85%, respectively. Uptake experiments of HOBr on aqueous H2SO4 as well as on H2SO4-acidified NaCl, RSS or NSS aerosol were performed for rh ranging from 40 to 93%. The gamma value of HOBr on acidified NSS reaches a maximum gamma = 1.9 x 10(-2) at rh = 76 +/- 1% and significantly decreases with increasing rh in contrast to acidified NaCl and RSS aerosols whose g values remain high at gamma = (1.0 +/- 0.2) x 10(-2) at rh >= 80%. An explanation based on the formation of an organic coating on NSS aerosol with increasing rh is proposed.
机译：在大气压层流反应器中测量已知大小分布的H2SO4酸化的亚微米盐气溶胶的HOBr和HOCl吸收系数γ。微量气体与气溶胶的相互作用时间为15到90 s，导致伽玛值在10（-4）到10（-2）之间。为了使HOBr在NaCl，重结晶海盐（RSS）和天然海盐（NSS）气溶胶上发生异质反应，气溶胶的酸度至关重要。具体而言，HOCl仅在酸度为0.4 x 10（-3）至1.8 x 10（-3）的酸化NSS气溶胶上分别在40％和85％的相对湿度（rh）下反应。进行HOBr在H2SO4水溶液以及H2SO4酸化的NaCl，RSS或NSS气溶胶上的吸收实验，其rh的范围为40％至93％。酸化的NSS上HOBr的伽马值在rh = 76 +/- 1％时达到最大伽马= 1.9 x 10（-2），并且与增加的rh相比显着降低，这与酸化的NaCl和RSS气溶胶的g值在伽马值较高时相反=（1.0 +/- 0.2）x 10（-2），rh> = 80％。提出了一种基于在rh增大的NSS气溶胶上形成有机涂层的解释。

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