Hygroscopicity of water-soluble organic compounds in atmospheric aerosols: Amino acids and biomass burning derived organic species
Hygroscopicity of water-soluble organic compounds in atmospheric aerosols: Amino acids and biomass burning derived organic species
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DOI：
10.1021/es049584l
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发表时间：
2005-03-15
影响因子：
11.4
通讯作者：
Chan, CK
中科院分区：
文献类型：
--
作者：
Chan, MN;Choi, MY;Chan, CK
生物质燃烧产生的氨基酸和有机物可能影响气溶胶的吸湿性和云凝结活动。七种氨基酸（甘氨酸，丙氨酸，丝氨酸，谷氨酰胺，苏氨酸，精氨酸和天冬酰胺）和生物质燃烧气溶胶（左旋葡聚糖，甘露聚糖和半乳糖）中最常见的三种有机物种的吸湿性测定使用电动平衡。在蒸发水时，在甘氨酸、丙氨酸、丝氨酸、谷氨酰胺和苏氨酸颗粒中观察到结晶，而在精氨酸和天冬酰胺颗粒中甚至在5%相对湿度（RH）下也没有观察到相变。这些水性氨基酸颗粒的水活性数据，除了精氨酸和天冬酰胺，用于修改UNIQUAC官能团活性系数中的相互作用参数，使预测值在测量值的15%以内。左旋葡聚糖、甘露聚糖和半乳聚糖颗粒既不结晶也不潮解。它们在低相对湿度下以高度浓缩的液滴形式存在，表明生物质燃烧气溶胶在低相对湿度下保持水分。此外，这些颗粒在吸湿生长中遵循非常相似的模式。本文提出了左旋葡聚糖、甘露聚糖和半乳聚糖颗粒的一般生长规律（G（f）=（1 - RH/100）（-0095））。
Amino acids and organic species derived from biomass burning can potentially affect the hygroscopicity and cloud condensation activities of aerosols. The hygroscopicity of seven amino acids (glycine, alanine, serine, glutamine, threonine, arginine, and asparagine) and three organic species most commonly detected in biomass burning aerosols (levoglucosan, mannosan, and galactosan) were measured using an electrodynamic balance. Crystallization was observed in the glycine, alanine, serine, glutamine, and threonine particles upon evaporation of water, while no phase transition was observed in the arginine and asparagine particles even at 5% relative humidity (RH). Water activity data from these aqueous amino acid particles, except arginine and asparagine, was used to revise the interaction parameters in UNIQUAC functional group activity coefficients to give predictions to within 15% of the measurements. Levoglucosan, mannosan, and galactosan particles did not crystallize nor did they deliquesce. They existed as highly concentrated liquid droplets at low RH, suggesting that biomass burning aerosols retain water at low RH. In addition, these particles follow a very similar pattern in hygroscopic growth. A generalized growth law (G(f) = (1 - RH/100)(-0095)) is proposed for levoglucosan, mannosan, and galactosan particles.