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Diffusion-controlled reference material for VOC emissions testing: effect of temperature and humidity.

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  • 1Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA.

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Summary
This summary is machine-generated.

A new reference material accurately predicts toluene emissions from building materials across various temperatures and humidity levels. This validated material ensures reliable volatile organic compound (VOC) measurements in environmental chambers.

Keywords:
ChamberDesorptionIndoorModelSorptionValidation

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Development of a polymethylpentene film reference material for measuring volatile organic compound (VOC) emissions from building materials.
  • Previous studies established material-phase diffusion (D) and partition (K) coefficients at 23°C.
  • A mass-transfer model was used to predict toluene emissions for validating environmental chamber measurements.

Purpose of the Study:

  • To investigate the impact of temperature and relative humidity (RH) on the performance of the toluene-loaded reference material.
  • To determine the applicability of the reference material under diverse environmental chamber testing conditions.

Main Methods:

  • Measured toluene emissions from the reference material at 10°C, 23°C, and 30°C, and varying RH levels.
  • Determined diffusion (D) and partition (K) coefficients at different temperatures and RH using an independent method.
  • Utilized statistical analysis to compare model-predicted and measured gas-phase concentrations.

Main Results:

  • Relative humidity (RH) showed no significant effect on D, K, or toluene emissions.
  • Toluene emissions increased substantially at elevated temperatures due to the temperature dependence of D.
  • Statistical analysis confirmed good agreement between model predictions and measured concentrations.

Conclusions:

  • The reference material demonstrates consistent performance across a range of temperatures and humidity levels.
  • The developed mass-transfer model accurately predicts emission profiles as a function of temperature.
  • The reference material is suitable for calibrating and validating emission testing procedures under various environmental conditions.