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

机译：甘氨酸与乙二醛发生乙二醛反应形成棕褐色水性碳的过程及其光化学性质

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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，棕色碳气溶胶作为气溶胶对光吸收和气候强迫的重要贡献者，在大气研究领域一直处于最前沿。可以通过乙二醛（GX）与甘氨酸（Gly）的水反应形成棕褐色碳。 GX–Gly混合物在紫外线和近可见光区域表现出光学特性的变化，可以通过紫外/可见光和荧光光谱法对其进行监测。在这项研究中，我们量化了由GX-Gly混合物生成的水性棕色碳形成过程中的吸收和激发-发射矩阵光谱。使用几个光学参数进一步证实了褐碳的形成，包括吸收系数，吸收埃指数，质量吸收系数，有效量子产率和荧光寿命值。过氧化氢氧化光解的结果表明，大气中的褐色碳水溶液可能被去除。棕色碳样品的荧光寿命值小于10 ns。液相色谱与质谱分析相结合用于研究GX-Gly混合物中棕色碳样品的可能化学成分。

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