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Oxidation of C_(60) Aerosols by Atmospherically Relevant Levels of O_3

机译：大气相关水平的O_3对C_（60）气溶胶的氧化作用

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摘要

Atmospheric processing of carbonaceous nanoparticles (CNPs) may play an important roie in determining their fate and environmental impacts. This work investigates the reaction between aerosolized C_(60) and atmospherically relevant mixing ratios of O_3 at differing levels of humidity. Results indicate that C_(60) is oxidized by O_3 and forms a variety of oxygen-containing functional groups on the aerosol surface, including C_(60)O, C_(60)O_2 and C_(60)O_3. The pseudo-first-order reaction rate betweenC_(60) and O_3 ranges from 9 × 10~(-6) to 2 × 10~(-5) s~(-1). The reaction is likely to be limited to the aerosol surface. Exposure to O_3 increases the oxidative stress exerted by the C_(60) 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_(60)O and C_(60)O_2 as intermediate products is enhanced at higher humidity, as is the surface oxygen content of the aerosols. These results show that C_(60) can be oxidized when exposed to O_3 under ambient conditions, such as those found in environmental, laboratory, and industrial settings.
机译：碳质纳米颗粒（CNP）的大气处理可能在决定其命运和环境影响方面发挥重要作用。这项工作研究了雾化的C_（60）与不同湿度下O_3与大气相关的混合比之间的反应。结果表明，C_（60）被O_3氧化并在气溶胶表面形成多种含氧官能团，包括C_（60）O，C_（60）O_2和C_（60）O_3。 C_（60）与O_3之间的拟一级反应速率为9×10〜（-6）到2×10〜（-5）s〜（-1）。反应很可能仅限于气溶胶表面。暴露于O_3会增加C_（60）气溶胶施加的氧化应激，这是通过二氯荧光素脱细胞测定法测定的，而不是通过尿酸，抗坏血酸，谷胱甘肽或二硫苏糖醇测定法测定的。作为中间产物的C_（60）O和C_（60）O_2的初始流行度在较高的湿度下得到了增强，气溶胶的表面氧含量也在增加。这些结果表明，C_（60）在环境条件下（例如在环境，实验室和工业环境中发现）暴露于O_3时可被氧化。

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  • 来源
    《Environmental Science & Technology》 |2014年第5期|2706-2714|共9页
  • 作者

    Andrea J. Tiwari; John R. Morris; Eric P. Vejerano; Michael F. Hochella Jr.; Linsey C. Marr;

  • 作者单位

    Civil & Environmental Engineering,Virginia Tech, Blacksburg, Virginia 24061, United States;

    Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States;

    Civil & Environmental Engineering,Virginia Tech, Blacksburg, Virginia 24061, United States;

    Geosciences, Virginia Tech, Blacksburg, Virginia 24061, United States;

    Civil & Environmental Engineering,Virginia Tech, Blacksburg, Virginia 24061, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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