Effect of using a cowl when measuring the fiber number concentration by the membrane filter method

Journal of Occupational and Environmental Hygiene
E Kauffer, Céline Eypert-Blaison

Abstract

This article compares samples taken with three different sampling heads: (1). open-faced sampling head, (2). open-faced sampling head with stainless-steel extension cowl, and (3). open-faced sampling head with graphite-impregnated extension cowl. Sampling was performed in three factories producing man-made mineral fibers (alkaline silicate fibers, refractory ceramic fibers, glass fibers). Flow rate was varied (1 L/min or 2 L/min). The average densities measured on the sampling filter for fibers of <3 microm in diameter varied from 19 to 91 fibers/mm(2). No significant difference in fiber density was observed in relation to the nature of the sampling head for fibers with a diameter of <3 microm. The deposits noted on the internal walls of the cowl were small and much less than that documented in the literature for man-made mineral fibers until now. They were greater for fibers with a diameter of >3 microm than for those with a diameter of <3 microm. For large-diameter fibers, it would appear that cowl deposit can be reduced by increasing the sampling flow rate.

References

Jan 1, 1987·The Annals of Occupational Hygiene·E Gonzalez-FernandezF R Martín
Jan 1, 1987·The Annals of Occupational Hygiene·N P CrawfordA D Jones
Jan 1, 1985·The Annals of Occupational Hygiene·K L KnightF Miller
Apr 25, 2001·Applied Occupational and Environmental Hygiene·P N BreysseC Robbins
Apr 1, 1994·New Solutions : a Journal of Environmental and Occupational Health Policy : NS·K Ringen

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Methods Mentioned

BETA
phase-contrast microscopy
scanning electron microscopy
phase contrast microscopy

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