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COMPARISON OF THE PARTICLE SIZE DISTRIBUTION OF HEAVY-DUTY DIESEL EXHAUST USING A DILUTION TAIL-PIPE SAMPLER AND IN-PLUME SAMPLER DURING ON-ROAD OPERATION
Citation:
Brown, J. E., M. J. Clayton, D B. Harris*, AND F. King*. COMPARISON OF THE PARTICLE SIZE DISTRIBUTION OF HEAVY-DUTY DIESEL EXHAUST USING A DILUTION TAIL-PIPE SAMPLER AND IN-PLUME SAMPLER DURING ON-ROAD OPERATION. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION. Air & Waste Management Association, Pittsburgh, PA, 50:1407-1416, (2000).
Description:
The paper compares the particle size distribution of heavy-duty diesel exhaust using a dilution tail-pipe sampler and an in-plume sampler during on-road operation. EPA's On-road Diesel Emissions Characterization Facility, modified to incorporate particle measurement instrumentation, has been used to develop gaseous emission factors for heavy-duty diesel trucks. An electrosdtativ low-pressure impactor was used to monitor the particle size distribution of the exhaust from a heavy-duty diesel truck with in excess of 900,000 miles on its odometer. One sample was obtained from the tail pipe, using a version of the University of Minnesota air-ejector-based minidilution sampler during 8 hours of nighttime operaqtion on 19-mile loops through the Tuscarora Tunnel on the Pennsylvania Turnpike. The second saple was from the plume just above the enclosed trailer at a point 11 m from the exhaust discharge over the same road the following nitght. Overall dilution ratios of about 300:1 were obtained for both the tail-pipe and plume sampling systems. Hundreds of particle size distributions were obtained esach night. A distribution of the medians of each individual distribution is compared for each location. The plume data show statistically larger particles than the tail-pipe data.