Simplified methods for characterizing dynamic sorption of SVOCs on viscous particles
Simplified methods for characterizing dynamic sorption of SVOCs on viscous particles
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表征粘性颗粒上 SVOC 动态吸附的简化方法
DOI：
10.1016/j.atmosenv.2020.117796
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发表时间：
2020
影响因子：
5
通讯作者：
Liu Ke
中科院分区：
文献类型：
--
作者：
Zhou Xiaojun;Luo Changgui;Wang Xinke;Liu Ke
暴露于室内和室外半挥发性有机化合物（SVOCs）对人体健康构成重大威胁。SVOCs在气体和颗粒物之间的动态传质，特别是高粘度有机物的动态传质，对室内外SVOCs的行为及其对人体健康的暴露风险起着重要作用。在这项研究中，提出了四个简化的方法来表征气体和颗粒之间的SVOCs的动态相互作用的基础上的传质模型的解析解。该方法既不需要复杂的级数计算，也不需要求解超越方程来估计气相和颗粒相之间的SVOC动力学行为。通过分析，得出了质量傅里叶数的临界值，质量毕奥数的临界值，即，0.1和20，用于将不同方法的应用范围划分为六个区域。计算结果表明，简化的方法是足够准确的估计SVOCs的饱和状态的粘性颗粒与不同的有机物种。在此基础上，讨论了颗粒内部SVOC的分布和达到平衡所需的时间。对苯并[a]芘在气相和不同颗粒物之间的吸附饱和度的计算结果表明，颗粒物中有机组分的粘度对SVOCs的吸附饱和度有显著影响。因此，当为研究气相和颗粒相之间SVOC的相互作用而做出平衡假设时，特别是在颗粒包含高粘度有机物质的情况下，应谨慎行事。
Exposure to indoor and outdoor semi-volatile organic compounds (SVOCs) poses a significant threat to human health. The dynamic mass transfer of SVOCs between gas and particles, especially those containing high-viscosity organic matter, plays an important role in determining the behavior of indoor and outdoor SVOCs and their exposure risk to human health. In this study, four simplified methods are proposed to characterize the dynamic interaction of SVOCs between gas and particles based on an analytical solution of the mass transfer model. The methods entail neither complex series calculations nor solutions to transcendental equations to estimate the SVOC dynamic behavior between the gas and particle phases. Through analysis, the critical value of mass Fourier number, i.e., 0.18, and the critical values of mass Biot number, i.e., 0.1 and 20, are used to divide the ranges of application of the different methods into six zones. The results calculated demonstrate that the simplified methods are sufficiently accurate to estimate the saturation state of SVOCs in viscous particles with different organic species. Based on these methods, the internal SVOC distribution in the particles and the time to reach equilibrium are discussed. The results calculated for benzo[a]pyrene between the gas phase and different particles show that the viscosity of the organic species in the particles has a significant impact on the sorption saturation degree of the SVOCs. Thus, caution should be exercised when the equilibrium assumption is made for studying the interaction of SVOCs between gas and particle phases, especially in the case of particles comprising organic species of high viscosities.