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Ann. occup. Hyg., Vol. 46, No. 2, pp. 187-195, 2002
© 2002 British Occupational Hygiene Society
Published by Oxford University Press

Article

Passive Sampler Used for Simultaneous Measurement of Breathing Zone Size Distribution, Inhalable Dust Concentration and Other Size Fractions Involving Large Particles

T. SCHNEIDER1,*, V. SCHLÜNSSEN2, P. S. VINZENTS1 and J. KILDESØ1

1National Institute of Occupational Health, Lersoe Parkalle 105, DK-2100 Copenhagen, Denmark; 2Department of Occupational and Environmental Medicine, Skive Hospital, Denmark

Received 26 March 2001; ; in final form 13 August 2001;

The particle size-dependent sampling velocity of the passive dust sampler developed by Vinzents (1996) is investigated under field conditions. Microscopical determination of the projected area equivalent diameter is used to quantify particles deposited on the sampler foils. Parameters for a semi-empirical model for particle deposition velocities on upward and forward facing foils are fitted to the data and it is shown that deposition mechanisms other than gravitational settling on the upward facing foil can be neglected. For calculation of airborne mass concentration no information on particle density is needed and only the ratio between the dynamic and volume shape factors needs to be known. Given the sampling velocity, the airborne mass per diameter interval is calculated from samples obtained in the wood industry, from which inhalable dust concentrations are calculated. The results are in line with parallel samples obtained with an inhalable dust sampler. A ‘total’ dust sampling characteristic can be fitted which reproduces measured ‘total’ dust with a closed face monitor. The results of this study demonstrate the validity of the passive dust sampling principle in environments involving even large (>100 µm) particles and the potential to predict the concentration of several size fractions.

Keywords: personal passive dust sampler; size distribution; sampling efficiency; inhalable dust; total dust


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