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• W3007372012 abstract "Abstract Amino acids is an important organic nitrogen compound class in aerosol. Its origins and transformation in the atmosphere remain poorly understood. The concentrations of free amino acids (FAAs) and combined amino acids (CAAs) and δ 15 N values of free and combined Glycine (Gly) in PM2.5 and main emission sources (plant, soil, and aerosol from biomass burning) were investigated from five sampling sites in Nanchang area (Jiangxi Province, China). Our results showed that the composition profiles of CAAs and FAAs were quite different from each other in PM2.5. For CAAs, percentages of individual combined amino acids were different between biomass burning sources and plant or soil sources, and we found that the composition profiles of aerosol CAAs could reflect the contribution of the main emission sources. For FAAs, a predominance of free Gly was observed in aerosol FAAs pool because atmospheric photooxidative processes could increase free Gly and decrease other reactive FAAs. This implied that the composition of aerosol FAAs could not reflect their origins. A strong correlation between δ 15 N F‐Gly values in aerosols or sources and the δ 15 N C‐Gly values in their parent CAAs was observed, indicating that the isotope effect associated with Gly transformation in aerosols may be small. Additionally, we found more positive δ 15 N Gly in aerosols emitted by biomass burning, which was likely due to 15 N‐depleted amino‐N loss from Gly molecule. The results suggested that δ 15 N Gly values in aerosols might be used to identify biomass burning sources." @default.
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• W3007372012 date "2020-03-06" @default.
• W3007372012 modified "2023-10-17" @default.
• W3007372012 title "Sources and Transformation Processes of Proteinaceous Matter and Free Amino Acids in PM2.5" @default.
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• W3007372012 doi "https://doi.org/10.1029/2020jd032375" @default.
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