State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China.
Molecules. 2023 Jul 7;28(13):5276. doi: 10.3390/molecules28135276.
Glyoxal and methylglyoxal are important volatile organic compounds in the atmosphere. The gas-particle partitioning of these carbonyl compounds makes significant contributions to O formation. In this study, both the gas- and particle-phase glyoxal and methylglyoxal concentrations at the foot and top of Mount Hua were determined simultaneously. The results showed that the gaseous-phase glyoxal and methylglyoxal concentrations at the top were higher than those at the foot of the mountain. However, the concentrations for the particle phase showed the opposite trend. The average theoretical values of the gas-particle partitioning coefficients of the glyoxal and methylglyoxal concentrations (4.57 × 10 and 9.63 × 10 m μg, respectively) were lower than the observed values (3.79 × 10 and 6.79 × 10 m μg, respectively). The effective Henry's law constants (eff.K) of the glyoxal and methylglyoxal were in the order of 10 to 10 mol/kgH2O/atm, and they were lower at the foot than they were at the top. The particle/gas ratios (P/G ratios) of the glyoxal and methylglyoxal were 0.039 and 0.055, respectively, indicating more glyoxal and methylglyoxal existed in the gas phase. The factors influencing the partitioning coefficients of the glyoxal and methylglyoxal were positively correlated with the relative humidity (RH) and negatively correlated with the PM value. Moreover, the partitioning coefficient of the glyoxal and methylglyoxal was more significant at the top than at the foot of Mount Hua.
乙二醛和甲基乙二醛是大气中重要的挥发性有机化合物。这些羰基化合物的气粒分配对 O3 的形成有重要贡献。在本研究中，同时测定了华山山脚和山顶的气相和颗粒相乙二醛和甲基乙二醛浓度。结果表明，山顶的气相乙二醛和甲基乙二醛浓度高于山脚。然而，颗粒相的浓度则呈现相反的趋势。乙二醛和甲基乙二醛浓度的气粒分配系数的理论平均值（分别为 4.57×10 和 9.63×10 mμg）低于观测值（分别为 3.79×10 和 6.79×10 mμg）。乙二醛和甲基乙二醛的有效亨利定律常数（eff.K）在 10 到 10 mol/kgH2O/atm 之间，山脚处的值低于山顶处的值。乙二醛和甲基乙二醛的颗粒/气体比（P/G 比）分别为 0.039 和 0.055，表明更多的乙二醛和甲基乙二醛存在于气相中。影响乙二醛和甲基乙二醛分配系数的因素与相对湿度（RH）呈正相关，与 PM 值呈负相关。此外，乙二醛和甲基乙二醛的分配系数在华山山顶处比山脚处更为显著。
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