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Evidence for organosulfates in secondary organic aerosol

机译:次级有机气溶胶中有机硫酸盐的证据

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Recent work has shown that particle-phase reactions contribute to the formation of secondary organic aerosol (SOA), with enhancements of SOA yields in the presence of acidic seed aerosol. In this study, the chemical composition of SOA from the photooxidations of alpha-pinene and isoprene, in the presence or absence of sulfate seed aerosol, is investigated through a series of controlled chamber experiments in two separate laboratories. By using electrospray ionization-mass spectrometry, sulfate esters in SOA produced in laboratory photooxidation experiments are identified for the first time. Sulfate esters are found to account for a larger fraction of the SOA mass when the acidity of seed aerosol is increased, a result consistent with aerosol acidity increasing SOA formation. Many of the isoprene and alpha-pinene sulfate esters identified in these chamber experiments are also found in ambient aerosol collected at several locations in the southeastern U.S. It is likely that this pathway is important for other biogenic terpenes, and may be important in the formation of humic-like substances (HULIS) in ambient aerosol.
机译:最近的工作表明,颗粒相反应有助于形成次级有机气溶胶(SOA),并在存在酸性种子气溶胶的情况下提高了SOA的产量。在这项研究中,在两个独立的实验室中,通过一系列受控室实验研究了在有或没有硫酸盐种子气溶胶的情况下,α-pine烯和异戊二烯的光氧化作用产生的SOA的化学成分。通过使用电喷雾电离质谱法,首次鉴定了实验室光氧化实验中产生的SOA中的硫酸酯。当种子气溶胶的酸度增加时,发现硫酸酯占了SOA质量的较大部分,这一结果与气溶胶酸度增加了SOA的形成是一致的。这些室试验中鉴定出的许多异戊二烯和α-pine烯硫酸酯也存在于美国东南部几个地点收集的环境气溶胶中。该途径可能对其他生物萜类很重要,并且可能对周围气溶胶中的类腐殖质(HULIS)。

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