Abstract
A diffusive sampler is described which is suitable for the determination of time weighted average personal exposures to airborne organic vapors. The sampler is in tube form and is designed so that existing thermal desorption techniques can be used for analysis. External flow effects have been eliminated by ensuring that the rate-determining step is the rate of diffusion across a fixed air gap. The effects of ambient humidity and temperature on diffusive uptake have been tested and shown to be small. Laboratory and field comparisons between the diffusive sampler and conventional pump and tube techniques suggest that field use of the sampler is valid.