Effects of two transition metal sulfate salts on secondary organic aerosol formation in toluene/NO x photooxidation
Effects of two transition metal sulfate salts on secondary organic aerosol formation in toluene/NO x photooxidation
复制标题
两种过渡金属硫酸盐对甲苯/NOx光氧化中二次有机气溶胶形成的影响
DOI：
10.1007/s11783-012-0476-x
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发表时间：
2013-02-01
影响因子：
6.4
通讯作者：
Jiang, Jingkun
中科院分区：
文献类型：
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作者：
Chu, Biwu;Hao, Jiming;Jiang, Jingkun
气溶胶相反应对二次有机气溶胶（SOA）的形成起着非常重要的作用，而含金属气溶胶是大气中的重要组成部分。在本研究中，我们测试了两种过渡金属硫酸盐硫酸锰 (MnSO4) 和硫酸锌 (ZnSO4) 对 2 m3 烟雾室中甲苯/NOx 光氧化系统光化学反应的影响。通过比较使用和不使用过渡金属硫酸盐种子气溶胶的实验的光化学反应产物，我们评估了过渡金属硫酸盐种子气溶胶对甲苯消耗、NOx转化以及臭氧和SOA形成的影响。 MnSO4 和 ZnSO4 种子气溶胶被发现对光化学反应具有相似的影响，两者都增强 SOA 的产生，而对气相化合物的影响可以忽略不计。当金属硫酸盐气溶胶浓度变化时，这些观察结果是一致的。这归因于 MnSO4 和 ZnSO4 种子气溶胶的催化作用，它们可能增强可冷凝半挥发性化合物的形成。它们随后分配到气溶胶相中，导致观察到的 SOA 形成增强。
Aerosol phase reactions play a very important role on secondary organic aerosol (SOA) formation, and metal-containing aerosols are important components in the atmosphere. In this study, we tested the effects of two transition metal sulfate salts, manganese sulfate (MnSO4) and zinc sulfate (ZnSO4), on the photochemical reactions of a toluene/NOx photooxidation system in a 2 m3 smog chamber. By comparing photochemical reaction products of experiments with and without transition metal sulfate seed aerosols, we evaluated the effects of transition metal sulfate seed aerosols on toluene consumption, NOx conversion and the formation of ozone and SOA. MnSO4 and ZnSO4 seed aerosols were found to have similar effects on photochemical reactions, both enhance the SOA production, while showing negligible effects on the gas phase compounds. These observations are consistent when varying metal sulfate aerosol concentrations. This is attributed to the catalytic effects of MnSO4 and ZnSO4 seed aerosols which may enhance the formation of condensable semivolatile compounds. Their subsequent partitioning into the aerosol phase leads to the observed SOA formation enhancement.