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Aqueous Photochemistry of Secondary Organic Aerosol of α-Pinene and α-Humulene in the Presence of Hydrogen Peroxide or Inorganic Salts
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2019-11-13 , DOI: 10.1021/acsearthspacechem.9b00222 Alexandra L. Klodt 1 , Dian E. Romonosky 1 , Peng Lin 2 , Julia Laskin 2 , Alexander Laskin 2 , Sergey A. Nizkorodov 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2019-11-13 , DOI: 10.1021/acsearthspacechem.9b00222 Alexandra L. Klodt 1 , Dian E. Romonosky 1 , Peng Lin 2 , Julia Laskin 2 , Alexander Laskin 2 , Sergey A. Nizkorodov 1
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The effect of common atmospheric solutes on aqueous-phase aging of secondary organic aerosol (SOA) was explored under irradiated and dark conditions. SOA particles were produced from dark ozonolysis of α-pinene or α-humulene in a photochemical smog chamber, collected on filters, and extracted in either pure water or aqueous solutions containing 0.010 mM H2O2, 0.15 mM NaNO3, or 0.15 mM NH4NO3. These aqueous samples were either irradiated for up to 4 h to simulate photochemical aqueous aging by sunlight or kept in the dark for the same amount of time to simulate nighttime aqueous chemistry of SOA. The chemical composition of SOA was monitored over time using direct infusion electrospray ionization high-resolution mass spectrometry. The presence of salts accelerated the loss of high-molecular-weight compounds, under both irradiated and dark conditions, making the dissolved SOA compounds smaller and more volatile. These effects of atmospheric salts have important implications for understanding SOA evolution in cloud and fogwater.
中文翻译：
过氧化氢或无机盐存在下α-P烯和α-Hu草烯的次级有机气溶胶的水光化学
在照射和黑暗条件下，研究了普通大气溶质对二次有机气溶胶（SOA）水相老化的影响。SOA颗粒从α蒎烯或α-蛇麻烯的暗臭氧分解在光化学烟雾室中产生，收集在过滤器上，并在含有0.010毫米高或者纯水或水溶液提取2 ö 2，0.15毫摩尔的NaNO 3，或0.15毫NH 4 NO 3。可以将这些水性样品辐照长达4小时以模拟日光照射下的光化学水性老化，或将它们在黑暗中放置相同的时间以模拟SOA的夜间水性化学。使用直接注入电喷雾电离高分辨率质谱仪随时间监测SOA的化学成分。盐的存在加速了在辐照和黑暗条件下高分子量化合物的损失，使溶解的SOA化合物更小，更易挥发。大气盐的这些影响对于理解云和雾水中的SOA演化具有重要意义。
更新日期：2019-11-13
中文翻译：
过氧化氢或无机盐存在下α-P烯和α-Hu草烯的次级有机气溶胶的水光化学
在照射和黑暗条件下，研究了普通大气溶质对二次有机气溶胶（SOA）水相老化的影响。SOA颗粒从α蒎烯或α-蛇麻烯的暗臭氧分解在光化学烟雾室中产生，收集在过滤器上，并在含有0.010毫米高或者纯水或水溶液提取2 ö 2，0.15毫摩尔的NaNO 3，或0.15毫NH 4 NO 3。可以将这些水性样品辐照长达4小时以模拟日光照射下的光化学水性老化，或将它们在黑暗中放置相同的时间以模拟SOA的夜间水性化学。使用直接注入电喷雾电离高分辨率质谱仪随时间监测SOA的化学成分。盐的存在加速了在辐照和黑暗条件下高分子量化合物的损失，使溶解的SOA化合物更小，更易挥发。大气盐的这些影响对于理解云和雾水中的SOA演化具有重要意义。
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