N2O5 hydrolysis on the components of mineral dust and sea salt aerosol: Comparison study in an environmental aerosol reaction chamber
N2O5 hydrolysis on the components of mineral dust and sea salt aerosol: Comparison study in an environmental aerosol reaction chamber
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DOI：
10.1016/j.atmosenv.2006.06.048
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发表时间：
2006-12
影响因子：
5
通讯作者：
Praveen K. Mogili;P. Kleiber;M. A. Young;V. Grassian
中科院分区：
文献类型：
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作者：
Praveen K. Mogili;P. Kleiber;M. A. Young;V. Grassian
在环境气溶胶室中研究了N_2O_5对矿尘和海盐气溶胶主要组分的非均相水解动力学。气相N2 O 5在碳酸盐、粘土和氧化物矿物上发生非均相反应生成HNO 3。硝酸水解产物在气相中迅速检测伴随着N2 O 5随时间的衰减。N2 O 5衰减动力学进行了测量和分析假设一级反应动力学。当归一化为表面积时，N2 O 5在不同矿物上的非均相衰减遵循反应性趋势;高岭石>赤铁矿>蒙脱石>方解石>石英。N2 O 5衰减是所有的矿物粉尘气溶胶组分相对于NaCl，海盐的主要成分，在相对湿度（RH）低于NaCl潮解点。所测得的非均相吸收系数在一个数量级以上的几个矿尘气溶胶相比，NaCl。吸收系数随相对湿度的增加而增加。
The kinetics of the heterogeneous hydrolysis of N2O5on some of the major components of mineral dust and sea salt aerosol have been investigated in an environmental aerosol chamber. Gas-phase N2O5undergoes heterogeneous reaction to form HNO3on carbonate, clay and oxide minerals. The nitric acid hydrolysis product was promptly detected in the gas phase concomitant with the decay of N2O5over time. The N2O5decay kinetics were measured and analyzed assuming first-order reaction kinetics. When normalized for surface area, heterogeneous decay of N2O5on the different minerals followed the reactivity trend; kaolinite > hematite > montmorillonite > calcite>quartz. N2O5decay was faster on all of the mineral dust aerosol components relative to NaCl, a major component of sea salt, at a relative humidity (RH) below the NaCl deliquescence point. The measured heterogeneous uptake coefficients were over an order of magnitude larger on several of the mineral dust aerosol compared to NaCl. The uptake coefficient was found to increase with RH.