SO2 Uptake on Oleic Acid: A New Formation Pathway of Organosulfur Compounds in the Atmosphere

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• 作者：Jing Shang ; Monica Passananti ; Yoan Dupart ; Raluca Ciuraru ; Liselotte Tinel ; Stéphanie Rossignol ; Sébastien Perrier ; Tong Zhu ; Christian George
• 刊名：Environmental Science & Technology Letters
• 出版年：2016
• 出版时间：February 9, 2016
• 年：2016
• 卷：3
• 期：2
• 页码：67-72
• 全文大小：296K

文摘

Organosulfates are tracers for secondary organic aerosol (SOA) formation. We propose a new mechanism of organosulfur product formation in the atmosphere, in which sulfur dioxide (SO₂) reacts directly with alkenes. The experiments were conducted at the gas–liquid interface with a coated-wall flow tube reactor. It was shown, for the first time, that SO₂ reacts efficiently with the unsaturated bond in oleic acid under atmospheric conditions (without ozone), leading to the formation of C₉ and C₁₈ organosulfur products. The associated uptake coefficients were in excess of 10^–6, decreasing with initial SO₂ concentration and increasing with humidity. These results might explain a fraction of organosulfur products detected in atmospheric particles. This work tends to elucidate the role of organosulfates’ interfacial chemistry as a potentially unrecognized pathway for their contribution to SOA formation; however, it remains to be determined how significant this pathway is to the overall organosulfate abundances measured in ambient aerosol.