The gas/particle partitioning behavior of phthalate esters in indoor environment: Effects of temperature and humidity
The gas/particle partitioning behavior of phthalate esters in indoor environment: Effects of temperature and humidity
复制标题
室内环境中邻苯二甲酸酯的气体/颗粒分配行为：温度和湿度的影响
DOI：
10.1016/j.envres.2020.110681
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发表时间：
2021
影响因子：
8.3
通讯作者：
Wang Xinke
中科院分区：
文献类型：
--
作者：
Zhou Xiaojun;Lian Juanli;Cheng Yan;Wang Xinke
邻苯二甲酸酯(PAE)是室内环境中普遍存在且含量最丰富的半挥发性有机化合物(SVOCs)。由于饱和蒸汽压低，SVOCs倾向于附着在室内表面和颗粒物上，这可能导致比仅在气相中出现的总浓度更高的总浓度。因此，PAE的气体/颗粒分配对它们的室内命运和健康风险起着重要的作用。然而，包括温度和湿度在内的室内环境参数对PAEs在空气和颗粒物之间分配的影响却鲜为人知。在这项研究中，设计了一种新型的实验系统来研究温度和湿度对气相和颗粒相PAE之间分配行为的影响。密封舱实验在12.5℃、17.5℃、24.0℃、29.5℃和40.0℃的温度下进行，水分含量为3.5 g/kg、5.0 g/kg、6.5 g/kg、8.0 g/kg和9.5 g/kg的干燥空气。结果表明，温度越高，聚氯乙烯板材中邻苯二甲酸酯的排放越强，导致邻苯二甲酸酯的气相浓度和颗粒相浓度越高。此外，温度对气体/颗粒分配系数(Kp)有很强的负效应，Kp在12.5~40℃之间相差一个数量级，Kp与绝对温度之间存在指数衰减规律。但湿度对Kp的影响小于温度对Kp的影响，没有明显的规律。此外，相对分子质量较大的Kpof化合物更受环境因素变化的影响。本研究对指导室内环境参数的调控，降低苯系物的健康风险具有积极意义。
Phthalate esters (PAEs) are ubiquitous and among the most abundant semi-volatile organic compounds (SVOCs) in indoor environments. Due to their low saturated vapor pressure, SVOCs tend to adhere to indoor surfaces and particulate matters, which may result in higher total concentrations than occur in the gas phase alone. Thus, gas/particle partitioning of PAEs plays an important role in their indoor fates and health risks. However, the influence of indoor environmental parameters, including temperature and humidity, on the partitioning of PAEs between air and particles is rarely known. In this study, a novel experimental system was designed to investigate the effects of temperature and humidity on partitioning behavior between gas- and particle-phase PAEs. The chamber experiments were conducted at temperatures of 12.5 °C, 17.5 °C, 24.0 °C, 29.5 °C and 40.0 °C and moisture contents of 3.5 g/kg, 5.0 g/kg, 6.5 g/kg, 8.0 g/kg and 9.5 g/kg dry air. The results showed that higher temperatures led to stronger emission of phthalate esters from the PVC panel, which resulted in higher gas-phase concentrations of phthalate esters and particle-phase concentrations. In addition, temperature has a strong negative effect on the gas/particle partition coefficient (Kp), and an order of magnitude difference inKpwas observed between 12.5 and 40 °C. There are exponential decay laws betweenKpand the absolute temperature. However, a smaller effect of humidity than of temperature onKpwas revealed, and no obvious law was found. Moreover,Kpof compounds with larger molecular weights are more obviously influenced by the variations in environmental factors. This study is of positive significance for reducing the health risks of PAEs by guiding the regulation of indoor environmental parameters.