Abstract
Recent theoretical and experimental evaluations of diffusive samplers are considered to show that two important factors affect sampler performance. First, the geometry of the device, principally the ratio of area to length, controls the uptake rate, the response-time and the effect of variations in the face velocity. Second, the physical and chemical nature of the sorbent determines the efficiency of sampling and desorption and the magnitude of the effects of sample retention and interferences. Combined, these factors control the maximum permissible sampling range in terms of exposure time and concentration. Careful consideration of geometry and sorbent enables selection of the most appropriate device for any situation. It is not felt that these devices offer a lower level of precision and accuracy compared to presently available dynamic sampling methods. Their enormous potential both in terms of cost and simplicity must be an important factor in any decision concerning their future role in industrial hygiene monitoring.