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化工学报  2015 

直流舱测定材料VOC散发关键参数的浓度轨迹法

DOI: 10.11949/j.issn.0438-1157.20150301, PP. 314-318

Keywords: 环境,散发,有机化合物,关键参数,直流舱,敏感性分析

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Abstract:

室内及车内环境中材料散发的挥发性有机化合物(VOC)是造成空气品质低劣的重要因素之一,显著影响着人们的舒适度和身体健康。材料VOC散发特性由3个关键参数表征:初始可散发浓度C0、扩散系数Dm和分配系数K。测定上述散发关键参数是研究材料VOC散发规律进而预测人体暴露和健康风险的基础。基于目前应用最广泛的直流舱中材料VOC的散发过程,提出了同时测定C0和Dm的浓度轨迹法。该方法通过预设K值,然后对环境舱浓度的对数进行线性拟合,根据斜率和截距获得关键参数C0和Dm。敏感性分析表明,不同的K值对测定的C0和Dm值影响很小。通过对文献中的直流舱散发实验数据进行处理,结果表明该测定方法具有较高的精度。

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