Scenario of SVOC configuration and adsorption on particle surface in indoor air

邻苯二甲酸二（2-乙基己基）酯（DEHP）等半挥发性有机化合物（SVOC）不仅会引起化学敏感性，还会引起哮喘。室内空气中的SVOCs以单分子（气相）和吸附物（颗粒相）的形式存在，因为它们的蒸气压很低。然而，他们的分配方法并不完善。本研究试图通过使用超声波雾化器产生气载关东壤土粉尘，使用扩散管量化DEHP在气相和颗粒相中的分配。结果表明，在特定条件下，DEHP蒸气可以以Langmuir型吸附等温线的方式吸附在气载关东壤土粉尘表面。

Semivolatile organic compounds (SVOCs) such as di(2-ethylhexyl) phthalate (DEHP) have caused not only chemical sensitivity but also asthma. SVOCs in indoor air exist in the form of a single molecule (gaseous phase) and adsorbate on airborne dusts (particulate phase) because of their low vapor pressures. However, their partitioning method was not well-established. This study attempted to quantify the partitioning of DEHP in gaseous and particulate phases using a diffusion tube by generating airborne Kanto loam dusts with an ultrasonic atomizer. As a result, it was suggested that DEHP vapor could be adsorbed on the surface of airborne Kanto loam dusts in the manner of Langmuir-type adsorption isotherm under the specific conditions.