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Comparison of Old vs. New CSN Carbon Sampling Methods in Sacramento, CA

This report examines the differences between the Old and New Carbon Sampling Networks (CSN) methods utilized during the meeting on January 22-23, 2008. It highlights the distinct characteristics of both sampling approaches, including the MetOne SASS and URG3000N samplers, differing flow rates, and analysis methodologies for Organic Carbon (OC) and Elemental Carbon (EC). A two-month collocation study at Phase 1 sites provides insight into data comparability, with minimal data loss and no artifact adjustments made. This comparison is critical for understanding and improving air quality monitoring protocols.

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Comparison of Old vs. New CSN Carbon Sampling Methods in Sacramento, CA

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  1. Carbon Meeting Joann Rice Sacramento, CA January 22-23, 2008

  2. “Old” versus “New” CSN Carbon • “Old” CSN • MetOne SASS sampler • 6.7 LPM flow rate with active flow control • 46.2-mm QMA Quartz filter • CSN TOT analysis by RTI • OC in He (900C); EC in He/O2 (920C) • “New” CSN • URG3000N sampler (IMPROVE-like) • 22 LPM flow rate with active flow control • 25-mm Pallflex Quartz filter • IMPROVE_A TOR analysis by DRI • OC in He (580C); EC in He/O2 (840C) • SOPs posted at http://www.epa.gov/ttn/amtic/specsop.html

  3. “Old” versus “New” CSN CarbonFirst Look • Two months (May-June 2007) of collocated old and new CSN at all Phase 1 sites • Collocation was resource restricted • For purposes of overlap only to minimize data loss • About 10-20 collocated observations per site • No artifact adjustments made to either old or new CSN data • No data screening for MDL or other outliers

  4. “Old” versus “New” CSN OC

  5. “Old” versus “New” CSN OC

  6. “Old” versus “New” CSN EC

  7. “Old” versus “New” CSN EC

  8. Collocated “Old” CSN OC

  9. Collocated “Old” CSN EC

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