Abstract The effect of ammonium sulfate ((NH 4 ) 2 SO 4 ) on the condensation of low-volatile organic compounds in atmospheric aerosol is considered. Using the UNIFAC model, a physicochemical analysis has been conducted for the condensation of ISNP—a product of photochemical transformations of isoprene and α-pinene in the atmosphere. The variability of the mass content of ISNP, mass concentration of aerosol particles, and their phase state at different temperatures (T) and relative humidities (RH) have been calculated. Transition of the organic component into the aqueous phase of ammonium sulfate particles is observed only at certain combinations of T and RH. In comparison with condensation in the absence of ammonium sulfate, the ISNP content at given T and RH can be lower or higher. The results of calculations indicate that the newly forming particles of mixed composition are characterized by a higher hygroscopicity and a higher capacity to be converted into drops (miscible liquid phase) at an air humidity lower than for particles that contain only ammonium sulfate.

中文翻译：

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大气气溶胶中矿物质和有机成分的相互影响

摘要 考虑了硫酸铵((NH 4 ) 2 SO 4 )对大气气溶胶中低挥发性有机物凝结的影响。使用 UNIFAC 模型，对 ISNP（异戊二烯和 α-蒎烯在大气中的光化学转化产物）的缩合进行了物理化学分析。计算了 ISNP 的质量含量、气溶胶颗粒的质量浓度及其在不同温度 (T) 和相对湿度 (RH) 下的相态的变化。仅在 T 和 RH 的某些组合下观察到有机组分向硫酸铵颗粒的水相的转变。与不存在硫酸铵的缩合相比，在给定的 T 和 RH 下，ISNP 含量可以更低或更高。