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MASS EMISSION RATES AND CHEMICAL CHARACTERIZATION OF PM 2.5 EMISSIONS FROM TWO MOTORCYCLES

MASS EMISSION RATES AND CHEMICAL CHARACTERIZATION OF PM 2.5 EMISSIONS FROM TWO MOTORCYCLES Deniz Karman and Colin Welburn Department of Civil and Environmental Engineering, Carleton University 1125 Colonel By Drive, K1S 5B6 Ottawa, Ontario, Canada Lisa A. Graham

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MASS EMISSION RATES AND CHEMICAL CHARACTERIZATION OF PM 2.5 EMISSIONS FROM TWO MOTORCYCLES

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  1. MASS EMISSION RATES AND CHEMICAL CHARACTERIZATION OF PM2.5 EMISSIONS FROM TWO MOTORCYCLES Deniz Karman and Colin Welburn Department of Civil and Environmental Engineering, Carleton University 1125 Colonel By Drive, K1S 5B6 Ottawa, Ontario, Canada Lisa A. Graham Environmental Technology Centre, Environment Canada 3439 River Road, K1A 0H3 Ottawa, Ontario, Canada 11TH CRC ON-ROAD VEHICLE EMISSIONS WORKSHOP San Diego, California March 26-28, 2001

  2. Overview • Considerations for PM2.5 sampling from vehicle exhaust • Motorcycle emission measurement program • Results & Discussion • PM2.5 Mass emission rates • Chemical characterization • Comparison with diesel bus emissions • Conclusions

  3. Sample Collection Goals • Dilute and cool the hot exhaust gases simulating the actual dilution process that occurs at the tailpipe or exhaust stack of a vehicle on the road • Capture sufficient sample on a filter without causing changes in the physical and chemical composition of the particulate matter

  4. Requirements of Dilution System • Easily cleaned between tests. • Useful for light duty gasoline and diesel vehicles and heavy duty diesel vehicles. • Residence time appropriate for collecting primary particle emission samples • Adequate conditioning of dilution air • Provide complete mixing of dilution air and hot exhaust before samples are collected

  5. Requirements of Dilution System • Simulate as much as possible real world dilution process • Present dilute samples to the collection media at a temperature and relative humidity consistent with ambient conditions. • Must be able to collect multiple, simultaneous samples using different sample collection methods and different sample media.

  6. ERMD Dilution System • Located in cold temperature test cell to simulate all seasons (25 to -20 °C) • Exhaust transfer line from vehicle to tunnel is heated and relatively straight to reduce PM loss. • Constructed of flanged pipe segments for easy cleaning. • All samples collected under iso-axial, isokinetic conditions.

  7. Critical Flow Venturi - Constant Volume Sampler

  8. Multiple PM2.5 samples collected in parallel from 2 isokinetic sampling probes in dilution tunnel

  9. Motorcycle testing • 2 motorcycles: • Suzuki 750 • Honda 600 • 2 gasoline fuels: • Summer Grade Commercial (SGC) • Low-sulfur (2 ppmw) • 3 driving cycles • LA4, US06, NYCC

  10. Collecting Sufficient Mass • More repeats of a test, same filter is exposed longer • 2 X LA4 ; first one cold start, followed by second one • 3 X US06 • 3 X NYCC

  11. PM2.5 Sample Analysis • Gravimetric  mg/mile • Chemical • Organic / Elemental Carbon • Ion Analysis • Ammonia • Sulphur Dioxide

  12. PM2.5 Emission Rates

  13. Results of Motorcycle Testing - Gravimetric Analysis • High degree of uncertainty in PM emission rates (5-94% RSD). • Uncertainty linked to low mass of PM collected on filters. • Cold Start emission rates not significantly different from Hot Start emission rates • US-06 and NYCC produce significantly higher emission rates compared to FTP

  14. OC/EC Analysis Supplemental Method Traditional Method Q T 1 1 Quartz Teflon Q Q 2 3 Quartz Quartz

  15. Organic Carbon in PM2.5- corrected for filter adsorption

  16. Organic/Elemental Carbon Analysis • Need to correct for sampling “artefacts” • Correction method critical for accurate results • Number of invalidated tests directly linked to mass of sample collected. • EC emission rates below detectable limits

  17. Measured Sulphur (SO4 and SO2) vs. Fuel S

  18. Sulphur Balance - Motorcycles • Fuel sulphur consumed >> sulphur collected as SO2 and PM-bound SO4. • Causes: • SO2 by-pass? • Gaseous sulphur species not identified?.

  19. PM2.5 Emission Rates - Diesel Bus on CBD

  20. Conclusions • PM2.5 mass emission rates from motorcycles are 1/1000 of emissions from bus - approaching limit of gravimetric method of measurement • the effect of aggressive driving cycles is noticeable • Motorcycle PM2.5 virtually all organic carbon • Current work: • Particle size distribution with SMPS and ELPI, potential for observing effect of driving conditions on emission rate and size distribution

  21. Acknowledgement • Contributions from the following programs are gratefully acknowledged: • PERD (Government of Canada Panel on Energy Research and Development) • TSRI - Health Canada (Toxic Substances Research Initiative) • NSERC -PGS (Natural Sciences and Engineering Research Council of Canada, Post Graduate Scholarships)

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