Oxidation of C60 Aerosols by Atmospherically Relevant Levels of O3

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• 作者：Andrea J. Tiwari ; John R. Morris ; Eric P. Vejerano ; Michael F. Hochella ; Jr. ; Linsey C. Marr
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：March 4, 2014
• 年：2014
• 卷：48
• 期：5
• 页码：2706-2714
• 全文大小：413K
• 年卷期：v.48,no.5(March 4, 2014)
• ISSN：1520-5851

文摘

Atmospheric processing of carbonaceous nanoparticles (CNPs) may play an important role in determining their fate and environmental impacts. This work investigates the reaction between aerosolized C<sub>60sub> and atmospherically relevant mixing ratios of O<sub>3sub> at differing levels of humidity. Results indicate that C<sub>60sub> is oxidized by O<sub>3sub> and forms a variety of oxygen-containing functional groups on the aerosol surface, including C<sub>60sub>O, C<sub>60sub>O<sub>2sub>, and C<sub>60sub>O<sub>3sub>. The pseudo-first-order reaction rate between C<sub>60sub> and O<sub>3sub> ranges from 9 脳 10<sup>鈥?sup> to 2 脳 10<sup>鈥?sup> s<sup>鈥?sup>. The reaction is likely to be limited to the aerosol surface. Exposure to O<sub>3sub> increases the oxidative stress exerted by the C<sub>60sub> aerosols as measured by the dichlorofluorescein acellular assay but not by the uric acid, ascorbic acid, glutathione, or dithiothreitol assays. The initial prevalence of C<sub>60sub>O and C<sub>60sub>O<sub>2sub> as intermediate products is enhanced at higher humidity, as is the surface oxygen content of the aerosols. These results show that C<sub>60sub> can be oxidized when exposed to O<sub>3sub> under ambient conditions, such as those found in environmental, laboratory, and industrial settings.