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Formation and photochemical properties of aqueous brown carbon through glyoxal reactions with glycine

机译：棕色碳水溶液通过甘氨酸乙醛反应的形成和光化学特性

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摘要

In recent years, brown carbon aerosols, as important contributors to light absorption and climate forcing by aerosols, have been forefront in the field of atmospheric research. Aqueous brown carbon can be formed through the aqueous reaction of glyoxal (GX) with glycine (Gly). GX-Gly mixtures exhibit changes in their optical properties in the ultraviolet and near visible regions, which can be monitored with ultraviolet/visible and fluorescence spectroscopy. In this study, we quantified the absorption and excitation-emission matrix spectra during the formation of aqueous brown carbon, which was generated from GX-Gly mixtures. The formation of brown carbon was further evidenced using several optical parameters, including absorption coefficient, absorption Angstrom exponents, mass absorption coefficient, effective quantum yields and fluorescence lifetime values. The results of hydrogen peroxide oxidation photolysis revealed the probable removal processes of the atmospheric aqueous brown carbon. The fluorescence lifetime values of the brown carbon samples were less than 10 ns. Liquid chromatography combined with mass spectrometry analysis was used to investigate the probable chemical composition of the brown carbon samples from GX-Gly mixtures.
机译：近年来，棕色碳气溶胶作为雾化吸收和气候强迫的重要贡献者，在大气研究领域是最前沿的。可以通过甘氨酸（GLY）的乙醛（GX）的水性反应形成棕色碳水溶液。 GX-GLY混合物在紫外线和近可见区域中表现出它们的光学性质的变化，其可以用紫外/可见和荧光光谱监测。在该研究中，我们在棕色碳水溶液中量化了吸收和激发 - 发射基质光谱，其由Gx-Gly混合物产生。利用几种光学参数进一步证明了棕色碳的形成，包括吸收系数，吸收抗埃指数，容量吸收系数，有效量子产量和荧光寿命值。过氧化氢氧化光解的结果显示了大气含水水溶液的可能除去方法。棕色碳样品的荧光寿命值小于10ns。结合质谱分析的液相色谱法用于研究来自Gx-Gly混合物的棕色碳样品的可能化学组成。

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  • 来源
    《RSC Advances》 |2018年第67期|共8页
  • 作者

    Gao Yan; Zhang Yunhong;

  • 作者单位

    Beijing Inst Technol Sch Chem &

    Chem Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Chem &

    Chem Engn Beijing 100081 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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