A new approach to determining gas-particle reaction probabilities and application to the heterogeneous reaction of deliquesced sodium chloride particles with gas-phase hydroxyl radicals

Laskin A; Wang H; Robertson WH; Cowin JP; Ezell MJ; Finlayson-Pitts BJ

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A new approach to determining gas-particle reaction probabilities and application to the heterogeneous reaction of deliquesced sodium chloride particles with gas-phase hydroxyl radicals

机译：确定气相反应概率的新方法及其在潮解氯化钠颗粒与气相羟基自由基异相反应中的应用

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The reaction kinetics for gaseous hydroxyl radicals (OH) with deliquesced sodium chloride particles (NaClaq) were investigated using a novel experimental approach. The technique utilizes the exposure of substrate-deposited aerosol particles to reactive gases followed by chemical analysis of the particles using computer-controlled scanning electron microscopy with energy-dispersive analysis of X-rays (CCSEM/EDX) capability. Experiments were performed at room temperature and atmospheric pressure with deliquesced NaCl particles in the micron size range at 70 - 80% RH and with OH concentrations in the range of 1 to 7 x 10(9) cm(-3). The apparent, pseudo first-order rate constant for the reaction was determined from measurements of changes in the chloride concentration of individual particles upon reaction with OH as a function of the particle loading on the substrate. Quantitative treatment of the data using a model that incorporates both diffusion and reaction kinetics yields a lower limit to the net reaction probability of gamma(net) >= 0.1, with an overall uncertainty of a factor of 2.

机译：使用新颖的实验方法研究了气态羟基自由基（OH）与潮解氯化钠颗粒（NaClaq）的反应动力学。该技术利用沉积了基质的气溶胶颗粒暴露于反应气体中，然后使用计算机控制的扫描电子显微镜对X射线进行能量色散分析（CCSEM / EDX），对颗粒进行化学分析。实验是在室温和大气压下用70-80％RH的微米尺寸范围的潮解NaCl颗粒和1至7 x 10（9）cm（-3）的OH浓度进行的。通过测量与OH反应时单个颗粒的氯化物浓度的变化作为底物上颗粒负载的函数来确定反应的表观伪一级反应速率常数。使用结合了扩散和反应动力学的模型对数据进行定量处理，可以使γ（net）> = 0.1的净反应概率产生下限，总不确定度为2。

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2006年第36期|共9页
作者
Laskin A; Wang H; Robertson WH; Cowin JP; Ezell MJ; Finlayson-Pitts BJ;
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SEA-SALT AEROSOL; AIR-WATER-INTERFACE; SCANNING-ELECTRON-MICROSCOPY; X-RAY-MICROANALYSIS; AIR/WATER INTERFACE; EMISSIONS INVENTORY; MOLECULAR-DYNAMICS; NITRIC-ACID; TROPOSPHERIC CHEMISTRY; ATMOSPHERIC PARTICLES;

机译：海盐气溶胶;空气界面;扫描电镜;X射线显微分析;空气/水界面;排放清单;分子动力学;硝酸;对流化学;大气颗粒;

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1. A new approach to determining gas-particle reaction probabilities and application to the heterogeneous reaction of deliquesced sodium chloride particles with gas-phase hydroxyl radicals [J] . Laskin A, Wang H, Robertson WH, The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory . 2006,第36期

机译：确定气相反应概率的新方法及其在潮解氯化钠颗粒与气相羟基自由基异相反应中的应用
2. Kinetic study of heterogeneous reaction of deliquesced NaCl particles with gaseous HNO3 using particle-on-substrate stagnation flow reactor approach [J] . Liu Y, Cain JP, Wang H, The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory . 2007,第40期

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4. Kinetics of gas-phase tropospheric reactions of organic solvents and hydroxyl radical by laser photolysis laser-induced fluorescence [C] . M.Kompitsas, A.Mellouki, Georges Le Bras, GR-I international conference on new Laser technologies and applications . 1998

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5. Gas-Phase Reactions of Methamphetamine with Hydroxyl Radicals and Ozone [D] . Forester, Crystal D. 2013

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7. Kinetic Study of Heterogeneous Reaction of Deliquesced NaCl Particles with Gaseous HNO3 Using Particle-on-Substrate Stagnation Flow Reactor Approach [O] . -1

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8. Configuration of a pulse radiolysis system for the study of gas-phase reactions and kinetic investigations of the reactions of hydroxyl radicals with methyl and ethyl radicals [R] . Fagerstroem, K 1993

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A new approach to determining gas-particle reaction probabilities and application to the heterogeneous reaction of deliquesced sodium chloride particles with gas-phase hydroxyl radicals

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