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 (K_p), and an order of magnitude difference in K_p was observed between 12.5 and 40 °C. There are exponential decay laws between K_p and the absolute temperature. However, a smaller effect of humidity than of temperature on K_p was revealed, and no obvious law was found. Moreover, K_p of 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.

邻苯二甲酸酯（PAE）普遍存在，并且在室内环境中是最丰富的半挥发性有机化合物（SVOC）之一。由于它们的低饱和蒸气压，SVOC倾向于粘附在室内表面和颗粒物上，这可能导致总浓度高于仅在气相中发生的浓度。因此，PAE的气体/颗粒分配在其室内命运和健康风险中起着重要作用。但是，室内环境参数（包括温度和湿度）对空气和颗粒之间的PAE分配的影响鲜为人知。在这项研究中，设计了一个新颖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。室实验在12.5°C，17.5°C，24.0°C，29的温度下进行。5°C和40.0°C，水分含量分别为3.5 g / kg，5.0 g / kg，6.5 g / kg，8.0 g / kg和9.5 g / kg干燥空气。结果表明，较高的温度导致PVC面板中邻苯二甲酸酯的排放量增加，从而导致邻苯二甲酸酯的气相浓度和颗粒相浓度较高。此外，温度对气体/颗粒分配系数有很大的负面影响（K _p），并且在12.5和40°C之间观察到K _p的数量级差异。在K _p和绝对温度之间存在指数衰减定律。但是，揭示出湿度对温度的影响小于温度对K _p的影响，并且没有发现明显的规律。此外，具有较大分子量的化合物的K _p更明显地受到环境因素变化的影响。这项研究对指导室内环境参数的调节对降低PAE的健康风险具有积极意义。