Gas/particle partitioning of semi-volatile organic compounds in the atmosphere: Transition from unsteady to steady state
Gas/particle partitioning of semi-volatile organic compounds in the atmosphere: Transition from unsteady to steady state
复制标题
大气中半挥发性有机化合物的气体/颗粒分配：从非稳态到稳态的转变
DOI：
10.1016/j.scitotenv.2019.136394
复制
发表时间：
2020-03-25
影响因子：
9.8
通讯作者：
Kannan, Kurunthachalam
中科院分区：
文献类型：
--
作者：
Li, Yi-Fan;Qiao, Li-Na;Kannan, Kurunthachalam
我们推导了确定半挥发性有机化合物(SVOCs)气体、颗粒分配动力学的微分方程式。这些方程通过建立稳态来模拟从吸附开始到颗粒(非稳态)的暂态。考察了两种假设情景：(1)仅在气相和颗粒相之间交换SVOCs；(2)气体/颗粒分配和颗粒的湿法沉积和DIY沉积。微分方程组表明，在情景1下，稳态是气相和颗粒相之间的平衡，而在情景2下，所获得的稳态是不平衡的。我们的模型表明，发生颗粒沉积的大气中的SVOCs比情景1下达到平衡的大气中的SVOCs更早达到稳定的非平衡状态。我们推断，在不能忽略颗粒干湿沉积的情况下，大气中的SVOCs将达到稳定状态，而不是气相和颗粒相之间的平衡。此外，我们的研究表明，SVOCs在大气中达到稳定板岩的时间很快，很可能在几分钟或几个小时内，这表明SVOCs在大气中处于稳定或准稳定状态。我们的分析还表明，气体/颗粒分配和颗粒沉积是相互依赖的。(C)2018爱思唯尔B.V.保留所有权利。
We derive differential equations to determine the kinetics of gas,particle partitioning of semi-volatile organic compounds (SVOCs). These equations model the transient states from initiation of sorption to particles (non-steady state) through the establishment of steady state. Two hypothetical scenarios are examined: (1) exchange of SVOCs between gas- and particle-phases alone; and (2) both gas/particle partitioning and wet and diy deposition of particles. The differential equations show that, under Scenario 1, a steady state is readied as an equilibrium between gas- and particle-phases, whereas under Scenario 2, the attained steady state is not in equilibrium. Our model shows that SVOCs in atmosphere where particle deposition is occurring reach a steady non-equilibrium state sooner than they would reach equilibrium under Scenario 1. We infer that SVOCs in the atmosphere will reach steady state instead of equilibrium between gaseous and particulate phases in circumstances where wet and dry deposition of particles cannot be neglected. In addition, our study indicates that the time for SVOCs to reach steady slate in the atmosphere is fast most likely within minutes or hours, suggesting that SVOCs are in steady or quasi-steady state in the atmosphere. Our analysis also reveals that gas/particle partitioning and particle deposition of SVOCs are dependent on each other. (C) 2018 Elsevier B.V. All rights reserved.