Abstract
If the sampling rate of a passive sampler is not known for an organic vapor of interest, it may be necessary to estimate the rate based on the diffusion coefficient of that vapor in air. Regression equations for two commercially available samplers were developed relating measured sampling rates to estimated diffusion coefficients. Two methods for estimating diffusion coefficients were evaluated. Ideal sampling rates (DA/L) averaged 27% to 61% higher than actual, measured rates. The use of these regression equations to estimate sampling rates is preferable to several other approaches using diffusion coefficient data. The Fuller-Schettler-Giddings method for estimating the diffusion coefficient is recommended because it is simpler and applicable to a greater number of compounds with no apparent loss of accuracy. This method was extended for use with organic vapors containing bromine.