BASIC STUDY ON MECHANISM OF SVOC ADSORPTION ONTO AIRBORNE PARTICLES IN INDOOR AIR
BASIC STUDY ON MECHANISM OF SVOC ADSORPTION ONTO AIRBORNE PARTICLES IN INDOOR AIR
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DOI：
10.3130/aije.82.663
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Kosuke Kondo;N. Kagi;N. Namiki
中科院分区：
文献类型：
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作者：
Kosuke Kondo;N. Kagi;N. Namiki
半挥发性有机化合物(SVOC)，如邻苯二甲酸二(2-乙基己基)酯(DEHP)，不仅可引起化学敏感性，还可诱发哮喘。在室内空气中，SVOCs被吸附在空气颗粒物和气相上。这一特性使得测量SVOC浓度和评估气相和颗粒相的分配变得困难。因此，通过前人的研究，提出了三种模型来评价气相和颗粒相之间的分配。然而，目前很少有研究考虑环境因素对大气颗粒物吸附SVOC机理的影响。本研究提取了各模型的特征，并通过实验研究了DEHP在大气颗粒物上的吸附机理。然后，用该模型对DEHP的吸附实验结果与理论值进行了比较。主要研究结果如下。随着燃烧室温度的升高，气相和颗粒相中的DEHP浓度增加，DEHP颗粒率降低。此外，较高的空气颗粒物浓度导致DEHP颗粒物浓度增加。空气中颗粒物组成的差异也影响了DEHP颗粒物的浓度。此外，基于Junge模型的估计与这些实验的结果很好地吻合。这些结果表明，颗粒物表面浓度与DEHP在空气颗粒物上的吸附机理有关。
Semi volatile organic compounds (SVOC), such as di(2-ethylhexyl) phthalate (DEHP), have not only caused chemical sensitivity, but also trigger asthma. SVOCs are adsorbed onto airborne particles as well as gas phase in indoor air. This characteristic makes it difficult to measure SVOC concentrations and evaluate the partitioning of gaseous and particulate phases. Therefore, three models are suggested to evaluate partitioning between the gaseous and particulate phases through the previous studies. However, there are currently few studies that take the influence of environmental factors on the mechanism of SVOC adsorption onto airborne particles into consideration. In this study, the characteristic of each model was extracted, and the mechanisms of DEHP adsorption onto airborne particles were investigated by experiments. Then, the experimental results for DEHP adsorption were compared with theoretical values by the models. The main results are as follows. The DEHP concentrations of gaseous and particulate phases increased and DEHP particulate ratio decreased as a chamber temperature rose. In addition, the high airborne particle concentrations caused an increase in the DEHP particulate concentration. The difference in the composition of airborne particles also influenced the DEHP particulate concentration. Moreover, estimates based on the Junge model corresponded well with the results of these experiments. These results indicated that particulate surface concentration is related to the mechanism of DEHP adsorption onto airborne particles.