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Issue 8, 2019
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Emissions of DEHP from vehicle cabin materials: parameter determination, impact factors and exposure analysis

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Abstract

Semi-volatile organic compounds (SVOCs) are widely used in materials employed in vehicle interiors, causing poor in-cabin air quality. The emission characteristics of SVOCs from vehicle cabin materials can be characterized by two key parameters: the gas-phase SVOC concentration adjacent to the material surface (y0) and the convective mass transfer coefficient across the material surface (hm). Accurate determination of y0 and hm is fundamental in investigating SVOC emission principles and health risks. Considering that the steady state SVOC concentration (y) in a ventilated chamber changes with the ventilation rate (Q), we developed a varied ventilation rate (VVR) method to simultaneously measure y0 and hm for typical vehicle cabin materials. Experimental results for di(2-ethylhexyl)phthalate (DEHP) emissions from test materials indicated that the VVR method has the merits of simple operation, short testing time, and high accuracy. We also examined the influence of temperature (T) on y0 and hm, and found that both y0 and hm increase with increasing temperature. A theoretical correlation between y0 and T was then derived, indicating that the logarithm of y0T is linearly related to 1/T. Analysis based on the data from this study and from the literature validates the effectiveness of the derived correlation. Moreover, preliminary exposure analysis was performed to assess the health risk of DEHP in a vehicular environment.

Graphical abstract: Emissions of DEHP from vehicle cabin materials: parameter determination, impact factors and exposure analysis

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Supplementary files

Article information


Submitted
28 Apr 2019
Accepted
25 Jun 2019
First published
01 Jul 2019

Environ. Sci.: Processes Impacts, 2019,21, 1323-1333
Article type
Paper

Emissions of DEHP from vehicle cabin materials: parameter determination, impact factors and exposure analysis

T. Yang, Z. He, S. Zhang, L. Tong, J. Cao and J. Xiong, Environ. Sci.: Processes Impacts, 2019, 21, 1323
DOI: 10.1039/C9EM00200F

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