Seasonal and diurnal variations of particulate organosulfates in urban Shanghai, China

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• 作者：Ye Ma ; Xinkai Xu ; Weihua Song ; Fuhai Geng ; Lin Wang
• 关键词：Organosulfates ; Secondary organic aerosols ; Shanghai ; Fine particulate matter
• 刊名：Atmospheric Environment
• 出版年：March, 2014
• 年：2014
• 卷：85
• 期：Complete
• 页码：152-160
• 全文大小：498 K

文摘

PM_2.5 samples have been collected in urban Shanghai, China, during April (spring), July (summer), October (autumn) 2012, and January (winter) 2013, respectively. Seventeen organosulfates (OSs) derived from isoprene, 伪-/尾-pinene, and presumably aromatic precursors were quantified using a high-performance liquid chromatogram coupled to a triple quadrupole mass spectrometer. During our sampling days, the total concentration of detected OSs ranged between 0.0209 and 60.8聽ng聽m^鈭? (sodium octyl sulfate and benzyl sulfate as standards). The seasonal average concentration of OSs was the highest (26.2聽ng聽m^鈭?) in summer 2012 and the lowest (0.510聽ng聽m^鈭?) in spring 2012, accounting for 0.471鈥?and 0.00965鈥?of the corresponding PM_2.5 mass, respectively. Isoprene- and 伪-/尾-pinene-derived OSs showed a clear seasonal fluctuation with a peak in summer, whereas OS derived from aromatic precursors was less variable in most seasons. The share of aromatic OS in the total measured OSs was the highest (63.5%) in winter 2013 and the lowest (2.94%) in summer 2012, suggesting that aromatic OS could serve as an important component of the OS species in urban Shanghai. In addition, a number of OSs demonstrated distinct diurnal profiles, reflecting diverse formation mechanisms with multiple atmospheric oxidants in an urbanized area like Shanghai.