EFFECT OF FACE VELOCITY ON PERFORMANCE OF DIFFUSIVE SAMPLERS

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Abstract
Two types of diffusive samplers, the DuPont Pro-Tek G-AA Gasbadge (sampler A) and the 3M #3500 Organic Vapor Monitor (sampler B), were exposed to toluene vapour under various face velocities (0–2.0 m s−). The vapour was prepared in an exposure chamber made of stainless steel and equipped with a small wind channel. The vapour concentration measured by the sampler B was almost the same as that in the chamber except when the face velocity was zero. However, the vapour concentration measured by the sampler A increased with the increasing face velocities. This tendency was increased when the airflow direction was perpendicular to the surface of the sampler. Copyright © 1996 British Occupational Hygiene Society.

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