A virtual impactor personal aerosol sampler (VIPAS) has been developed for use in diesel-equipped mines to collect size-separated samples of diesel exhaust and mine dust particles in the respirable size range. This sampler consists of three stages: A 10-mm cyclone, a 0.8-μm cutpoint virtual impactor and two filter cassettes. The large nonrespirable particles are removed in a 10-mm cyclone. The respirable particles from the cyclone pass through a 0.8-μm cutpoint virtual impactor with the particles larger than and smaller than 0.8 μm (mine dust and diesel exhaust particles, respectively) collected on two 37-mm filter cassettes. The sampling flow rate is 2 L/min so as to be compatible with the standard respirable dust sampler and personal sampling pumps.
Bibliographical noteFunding Information:
This research has becn supported by the Department of the Interior's Mineral Institute program administered by the Burcau of Mines through the Gcncric Mineral Technology Centcr for Respirable Dust under grant number G-1135142. The coopcration of the Bureau of Mines Twin Cities Research Centcr with the field evaluation is greatly appreciated.