Evidence for the existence of organosulfates from β-pinene ozonolysis in ambient secondary organic aerosol
Evidence for the existence of organosulfates from β-pinene ozonolysis in ambient secondary organic aerosol
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DOI：
10.1021/es070938t
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发表时间：
2007-10-01
影响因子：
11.4
通讯作者：
Herrmann, Hartmut
中科院分区：
文献类型：
--
作者：
Iinuma, Yoshiteru;Muller, Conny;Herrmann, Hartmut
在一系列室内气溶胶室实验中，研究了中性或酸性硫酸盐颗粒存在下β-蒎烯气相臭氧分解生成有机硫酸盐的过程。使用高效液相色谱法（LC）耦合电喷雾电离-飞行时间质谱（MS）在平行的离子阱MS的有机硫酸盐进行了分析。有机硫酸盐只被发现在二次有机气溶胶从β-蒎烯臭氧分解在酸性硫酸盐种子颗粒的存在下。在德国巴伐利亚州东北部的一个森林站点收集的环境气溶胶样本中也发现了一种有机硫酸盐。β-氧化Pinene是β-Pinene/O-3和β-Pinene/NO3反应中的氧化产物，被确定为β-Pinene衍生的有机硫酸盐的可能前体。此外，在环境样品中发现了几种来自单萜的硝基有机硫酸盐。这些硝基有机硫酸盐只在夜间样品中检测到，这表明夜间化学在其形成中的作用。它们的LC/MS色谱峰强度表明，它们代表了环境气溶胶中有机质量的重要部分，特别是在夜间。
The formation of organosulfates from the gas-phase ozonolysis of beta-pinene in the presence of neutral or acidic sulfate particles was investigated in a series of indoor aerosol chamber experiments. The organosulfates were analyzed using high-performance liquid chromatography (LC) coupled to electrospray ionization-time-of-flight mass spectrometry (MS) in parallel to ion trap MS. Organosulfates were only found in secondary organic aerosol from beta-pinene ozonolysis in the presence of acidic sulfate seed particles. One of the detected organosulfates also occurred in ambient aerosol samples that were collected at a forest site in northeastern Bavaria, Germany. beta-Pinene oxide, an oxidation product in beta-pinene/O-3 and beta-pinene/NO3 reactions, is identified as a possible precursor for the beta-pinene-derived organosulfate. Furthermore, several nitroxy-organosulfates originating from monoterpenes were found in the ambient samples. These nitroxy-organosulfates were only detected in the nighttime samples, suggesting a role for nighttime chemistry in their formation. Their LC/MS chromatographic peak intensities suggest that they represent an important fraction of the organic mass in ambient aerosols, especially at night.