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Aerosol Brown Carbon from Dark Reactions of Syringol in Aqueous Aerosol Mimics
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-04-18 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00010 Jian Xu 1 , Tianqu Cui 2 , Brandon Fowler , Alison Fankhauser , Kai Yang , Jason D. Surratt 2 , V. Faye McNeill
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-04-18 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00010 Jian Xu 1 , Tianqu Cui 2 , Brandon Fowler , Alison Fankhauser , Kai Yang , Jason D. Surratt 2 , V. Faye McNeill
Affiliation
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We performed a laboratory investigation of the chemical processing of syringol, a representative model phenolic compound emitted from wood burning, in concentrated aqueous salt solutions mimicking tropospheric aerosol particles. For solutions containing chloride salts, we observed the formation of light-absorbing organic products (“brown carbon”), accompanied by a phase separation, within 10 h under dark conditions. Products were characterized at the molecular level using ultraperformance liquid chromatography interfaced to diode array detection and high-resolution quadrupole time-of-flight mass spectrometry equipped with electrospray ionization and matrix-assisted laser desorption/ionization interfaced to high-resolution time-of-flight mass spectrometry. The ultraviolet–visible spectra, together with high-resolution mass spectra results, suggest that syringol can be oxidized by dissolved oxygen, and the presence of Cl– promotes this reaction. Our results provide new insights into the evolution of aerosol optical properties during aging, specifically the formation of aerosol brown carbon in biomass-burning plumes.
中文翻译：
丁香酚在水性气溶胶模拟物中的黑暗反应产生的气溶胶棕碳
我们对模拟对流层气溶胶颗粒的浓盐水溶液中丁香酚的化学处理进行了实验室研究，丁香酚是木材燃烧产生的代表性模型酚类化合物。对于含有氯化物盐的溶液，我们观察到在黑暗条件下10小时内会形成光吸收性有机产物（“棕碳”），并伴随相分离。使用与二极管阵列检测接口的超高性能液相色谱和配备电喷雾电离和与高分辨率飞行时间接口的基质辅助激光解吸/电离的高分辨率四极杆飞行时间质谱仪，在分子水平上对产品进行表征质谱。紫外可见光谱，以及高分辨率质谱图，–促进这种反应。我们的结果为老化过程中气溶胶光学特性的演变提供了新的见解，特别是在燃烧生物质的烟羽中形成气溶胶棕碳的过程。
更新日期：2018-04-18
中文翻译：
丁香酚在水性气溶胶模拟物中的黑暗反应产生的气溶胶棕碳
我们对模拟对流层气溶胶颗粒的浓盐水溶液中丁香酚的化学处理进行了实验室研究，丁香酚是木材燃烧产生的代表性模型酚类化合物。对于含有氯化物盐的溶液，我们观察到在黑暗条件下10小时内会形成光吸收性有机产物（“棕碳”），并伴随相分离。使用与二极管阵列检测接口的超高性能液相色谱和配备电喷雾电离和与高分辨率飞行时间接口的基质辅助激光解吸/电离的高分辨率四极杆飞行时间质谱仪，在分子水平上对产品进行表征质谱。紫外可见光谱，以及高分辨率质谱图，–促进这种反应。我们的结果为老化过程中气溶胶光学特性的演变提供了新的见解，特别是在燃烧生物质的烟羽中形成气溶胶棕碳的过程。
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