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首页> 外文期刊>Atmospheric environment >Gas/particle partitioning of neutral and ionizing compounds to single- and multi-phase aerosol particles. 2. Phase separation in liquid particulate matter containing both polar and low-polarity organic compounds
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Gas/particle partitioning of neutral and ionizing compounds to single- and multi-phase aerosol particles. 2. Phase separation in liquid particulate matter containing both polar and low-polarity organic compounds

机译：将中性和离子化化合物的气体/颗粒分配为单相和多相气溶胶颗粒。 2.包含极性和低极性有机化合物的液体颗粒物的相分离

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摘要

A modeling method is developed for use in predicting the stability of multiple liquid phases in atmospheric particulate matter (PM). The method utilizes a pseudo-diffusion process that simulates the multicomponent inter-phasic movement of constituents between adjacent PM phases. It can be used as a stand-alone application, and can also be incorporated in overall gas/particle (G/P) partitioning models of aerosol PM formation. Previously studied (Environ. Sci. Technol. 35 (2001) 1806) relative-humidity (RH)-dependent PM compositions resulting from the ozone oxidation of five different volatile organic compounds (VOCs) were verified as being stable as single phases. A number of additional cases were considered in which RH-dependent secondary PM compositions were amended with a mix of low-polarity (LP) organic compounds. It was determined that, depending on the mass fraction of added LP-mix, the PM can be more stable as a two-phase system. Phase separation into two phases can occur even in the absence of water in the PM. Assuming a single liquid PM phase when two are actually present will generally lead to an underprediction of TPM. For the cases considered here, the calculated errors in predicted TPM levels were found to range from -3.9% to -21.8%; conditions can be envisioned that would lead to even larger errors.
机译：开发了一种建模方法，用于预测大气颗粒物（PM）中多个液相的稳定性。该方法利用伪扩散过程，该过程模拟了相邻PM相之间成分的多组分相间运动。它可以用作独立应用程序，也可以合并到气溶胶PM形成的整体气体/颗粒（G / P）分配模型中。先前研究的（Environ。Sci。Technol。35（2001）1806）由五种不同的挥发性有机化合物（VOC）的臭氧氧化产生的依赖于相对湿度（RH）的PM组合物被证实是稳定的单相。考虑了许多其他情况，其中，RH依赖的二次PM组合物用低极性（LP）有机化合物的混合物进行了修正。已经确定，取决于所添加的LP-混合物的质量分数，PM作为两相系统可以更稳定。即使在PM中不存在水，也会发生两相分离。假设一个液态PM相实际存在两个时，通常会导致TPM的预测不足。对于此处考虑的情况，发现预测的TPM水平的计算误差范围为-3.9％至-21.8％；可以预见会导致更大错误的条件。

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