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IV. Diesel Particulate Measurement: Chairman: Dr. Lewis Wade Research Director Twin Cities Research Center U.S. Bureau of Mines Minneapolis, MN 554 17

Diesel Exhaust/Mine Dust Personal Aerosol Sampler Utilizing Virtual Impactor Technology

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Pages 721-727 | Published online: 24 Feb 2011
 

Abstract

Research has shown that in coal mines utilizing diesel-powered equipment, the diesel exhaust particles are primarily smaller than 0.8 μm in size, while the mine dust particles are larger than 0.8 μm. Formerly, three-stage personal samplers have been designed for separating the diesel exhaust from the mine dust particles by dividing the respirable particles at a particle size of 0.8 μm. Conventional impactors or cyclones were used to obtain the 0.8-μm cut point and to collect the mine dust particles on an impaction plate substrate or in a foil cup, and the diesel exhaust particles on a filter. However, these samplers had potential problems with particle overloading on the substrates and particles not being collected in conventional filter cassettes. A diesel exhaust/mine dust virtual impactor personal aerosol sampler (VIPAS) has been developed for use in diesel-powered underground coal mines that addresses the shortcomings of the previously designed samplers. The VIPAS consists of the 10-mm cyclone to remove the large, nonrespirable particles, followed by a 0.8-μm cut point virtual impactor and two filter cassettes to divide and collect the two particle size fractions: the respirable coal dust and the respirable diesel particles.

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