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Ann. occup. Hyg., Vol. 35, No. 3, pp. 273-285, 1991
© 1991 British Occupational Hygiene Society
Published by Oxford University Press

research-article

A COMPUTER MODEL FOR CALCULATING EFFECTIVE UPTAKE RATES OF TUBE-TYPE DIFFUSIVE AIR SAMPLERS

N. VAN DEN HOED and O. L. J. VAN ASSELEN

Koninklijke/Shell-Laboratorium, Amsterdam (Shell Research B.V.) Badhuisweg 3, 1031 CM Amsterdam, The Netherlands

A computer model has been developed for calculating the effective uptake rates of tubetype diffusive air samplers. The model approximates the mass transport in the sampler by a sequence of steady-state processes to which Fick's first law of diffusion can be applied. An iterative procedure was developed for assessing the effective uptake rate in the field at unknown ambient air concentrations. Calculated uptake rates show good agreement with values determined experimentally under various conditions of concentration and exposure time. The model is particularly useful for sampling multi-component atmospheres since no single adsorbent is ideal for all compounds simultaneously. A field test has demonstrated the applicability of the model under practical conditions.


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