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Determining diffusion and partition coefficients of VOCs in cement using one FLEC

Authors
Journal
Building and Environment
0360-1323
Publisher
Elsevier
Publication Date
Volume
41
Issue
9
Identifiers
DOI: 10.1016/j.buildenv.2005.05.005
Keywords
  • Mass Diffusion
  • Inverse Problem Of Mass Diffusion
  • Voc
  • Diffusion Coefficient
  • Partition Coefficient
  • Gc-Msd
  • Atd
  • Cement Slab

Abstract

Abstract The diffusion and partition coefficients of eight volatile organic compounds (VOCs) in cement slabs were experimentally determined using a field and laboratory emission cell (FLEC) system based on the method developed in a previous study on the water vapor diffusion. A cement slab planted with a mixture of eight VOCs was placed in an one-FLEC system to undergo the mass diffusion in the slab and the emission to air flowing through the FLEC. The concentration of each VOC in the air flowing out of the FLEC was measured according to the EPA Method TO-17 using sorbent tube-automatic thermal desorption (ATD) and the gas chromatography-mass spectrum detector (GC-MSD) system. The diffusion and partition coefficients were then obtained by solving the inverse problem of the one-dimensional unsteady mass diffusion equations in the cement slab. And, the partition coefficient was also obtained from the total mass transfer estimated from the VOC concentration measurements and air flowrate, which was equivalent to the headspace concentration-weighting method.

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