PRELIMINARY RESULTS from PIE 2005 the PAN Intercomparison Exercise F' Flocke, G' Tyndall, E' Apel NC

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PRELIMINARY RESULTSfromPIE 2005the PAN
Intercomparison ExerciseF. Flocke, G. Tyndall,
E. Apel (NCAR)E. Williams (NOAA)
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PIE 2005

• 6/28-7/8/2005
• Enchanted Mesa
• eight different instruments
• from Canada, Germany, Japan, the UK, and the US
• five different methods
• ambient and standards measurements

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results arePRELIMINARY
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Instruments

• Hiroshi Tanimoto, NIES, Japan GC/MS
• Graham Mills, UEA, UK, GC/ECD
• Stefan Gilge, DWD, Germany, GC/ECD
• Bernhard Rappenglueck and Rainer Schmitt, U.
  Houston and Metcon, Germany, GC/ECD
• Jason OBrien, Environment Canada, GC/PDD
• Ron Cohen, Paul Wooldridge, Anne Perring,
  UCBerkeley, TD-LIF
• Jim Roberts, NOAA, GC/ECD
• Aaron Swanson, NCAR and Saewung Kim, GaTech, CIMS
• (Frank Flocke, NCAR, Dual-GC/ECD)

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Other Instruments

• Meteorological parameters (NOAA)
• NO, NO2, O3 (NOAA)
• NOy reference instrument in referee trailer (NCAR)

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Enchanted Mesa
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The forbidden zone
Flow 1220 slpm
standards
ambient
GC5
Internet Access, email
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UEA GC/ECD

• Restek MXT-200 Column
• 0.53 ID, 10 m, 1.0µ film
• 22 sccm
• 17 ºC isothermal
• cycle time 10 minutes
• PAN, PPN

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Env. CAN GC/PDD

• Restek MXT-200 Column
• 0.53 ID, 8 m, 1.0µ film
• 35 sccm
• 15 ºC isothermal
• cycle time 10 minutes
• PAN, PPN

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NOAA GC/ECD

• Restek Rtx-200 Column
• 0.53 ID, 7.5 m, 1.0µ film
• 10 sccm
• 15 ºC isothermal
• cycle time 5 minutes
• PAN, PPN, APAN, MPAN, PiBN

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NIES GC/MS

• DB-1 MS Column
• 0.25 ID, 10 m, 0.25µ film
• 2 sccm
• cycle time 10 minutes
• PAN, PPN, APAN, MPAN, PiBN, PnBN

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UH/Metcon GC/ECDDWD GC/ECD

• DB1/DB-5 Column combination
• 0.53 ID, 10 m total
• 20 sccm
• 15 ºC isothermal
• PAN, PPN
• cycle time 10 minutes
• DWD GC has modified flow control (PAN only)

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UC Berkeley TD-LIF

• measures NO2 by LIF
• has 3 thermal decomposition stages held at 150,
  300 and 550 degrees decomposing all PANs, ANs,
  NOy into NO2
• cycle time 10 seconds
• measures the sum of all PANs

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NCAR/GaTech CIGAR

• measures PANs by CIMS
• PAN, PPN, PBN, APAN, MPAN, PBzN, MoPAN, PPeN, ...
• cycle time 2 seconds
• scans should show additional PANs unless they are
  very sticky

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NCAR 2 Channel GC/ECD(reference instrument)

• 2 RTX-200 Columns
• 7.5m, 0.53 ID, 1.0µ film
• 20 sccm
• 20 ºC isothermal
• cycle time 3 minutes
• PAN, PPN, APAN, MPAN, PiBN

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Measurements

• all measurements from common manifold
• ambient air
• PAN and PPN standards in dry zero-air from
  manifold
• PAN and PPN standards in humidified zero air
• i-Propyl nitrate (interferent) in zero-air

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PRELIMINARY
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Ambient Measurements
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6/30/05 trace
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6/30/05 trace
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7/4/05 trace
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7/4/05 trace
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All ambient data
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All ambient data
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All ambient data
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All ambient data
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i-Propyl nitrate
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PPN ambient
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PPN ambient
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PPN ambient
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Standards
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Standards
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Standards
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Standards
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Standards
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PRELIMINARY
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LIF and the sum of PANs
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6/30 ambient trace
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7/1 ambient trace
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7/5 ambient trace
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Standard comparison with LIF
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Conclusions (for now)

• very good agreement for ambient PAN measurements,
  considering its field data
• acceptable agreement for ambient PPN measurements
  (might improve)
• LIF measures consistently higher than sum of
  individual PANs (expected?)
• extra PANs that GCs and CIMS miss?
• no indication of LIF counting ANs as PANs
• LIF NO2 background subtraction problem?
• more work has to be done to produce final data
  and merge measurements together
• compare MPAN, APAN, PBN