A method has been previously described for using a sodium chloride (nacl) aerosol to measure penetration through respirator filters. The detector used at that time was not sensitive enough to determine the penetration of high-efficiency filters designed for protection against highly toxic particulates and radio-nuclides. In the present method, an ultrasonic nebulizer is still used to produce a nacl mist. The nacl concentration has been reduced to 10 ug/liter, and the particle size has been decreased to 0.53 Um mass median diameter. Respirator filters were exposed to this aerosol at airflows of 16 and 42.5 Liter/min. The flame photometric detector in this study could determine filter penetration in the range of 0.0005 to 51.6 percent. This is suitable for measuring the penetration of high-efficiency filters.
Am. Ind. Hygiene Assoc. J., December 1972, PP. 971-996
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