side-by-side ambient comparison of capture vs standard...
TRANSCRIPT
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Side-by-side ambient comparison of Capture vs
Standard Vaporizer
Weiwei Hu, Pedro Campuzano-Jost, Doug Day, Jose L. Jimenez, Phil Croteau, and John T. Jayne
University of Colorado-Boulder & Aerodyne Research
7-Sep-2013: AMS Users Meeting, Prague(Analysis still preliminary)
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Motivation: Field Comparison of OA for 3 AMSs + 1 ACSM (all standard vaporizer)
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So just compare the AMS w SMPS!
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Experimental Setup
HR-AMS 2STD
VAPORIZER,ePToF
HR-AMS 1Capture
VAPORIZER
CU Roof
10 lpm
1.2 lpm
0.6 lpm
0.6 lpm
5 min V5 min W
5 min V/PToF5 min V/ePToF
Both AMS were AN, AS and size calibrated before the comparison
Capture Vaporizer was being run at 4 W, PToF sample time ~ 1 min/5 min cycle
Dry (< 15% RH)
CE = 0.5 for Std vaporizer (per Middlebrook et al., AS&T 2012)
John Jaynes’s presentation forePToF results
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Time Series of Main Species
Using measured IE, NH4 RIE and SO4 RIE on each vaporizer
Fresh Plumes Period, CE=1 was applied to Org in standard Vaporizer
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CaptureStandard
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Species scatter plots
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Cap
ture
Standard
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Tge
Monodisperse NH4NO3 in PToF
Capture vaporizer has delayed signals (e.g 30 s for 400 nm), and broader peaks
Capture
Standard
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Monodisperse (NH4)2SO4 in PToF
The size distribution of pure (NH4)2SO4 in the capture vaporizer was broadened due to the longer vaporization time. 8
Capture
Standard
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Ambient size distribution: Std vs captureShifting the standard vapPToF by 500 us makes the high volatity species (AN) collapse on top of each other. So while delayed and slightly smeared, PToFseems useful!
Warning: Slightly unfair comparison 1% chopper (capture vap) vs ePToF (standard vap)9
CaptureStandard
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Sulfate Fragmentation
• Only SO2+ & SO+
• SO2+/SO+ ratio slightly larger 10
CaptureStandard
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Nitrate Fragmentation
While detecting RONO2 with the capture vaporizer is not impossible, at ambient concentrations it might be quite challenging… 11
CaptureStandard
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HR average spectra (Normalized to 1)
More small fragments (e.g m/z 28, 40, 44) in capture vaporizer, and less higher m/z 12
Capture
Standard
Capture - Standard
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HR Spectra of Fresh “Cooking” Plumes
Capture
Standard
Capture - Standard
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f44 comparison and Sally’s Triangle
• f44 is probably still an O/C proxy but some new complications, may need replacement for f43
• m/z 40 and 55 can be enhanced, so possibly we can use those instead 14
f 44
Cap
ture
f44 Standard
Standard
Capture
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Nominally higher O/C and lower H/C w/ capture vap.
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Still shows the same evolution Need to re-calibrate the elemental analysis
Capture
Standard
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CO+/CO2+ & H2O+/CO2
+
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Cap
ture
Stan
dard
V
Cap
ture
Stan
dard
W
Frag
Tab
le
Stan
dard
V
Stan
dard
W
Frag
Tab
le
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Biomass Burning Tracer f60
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Capture
Standard
Non-BB background
Non-BB background
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PMF Comparison
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CaptureStandard
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Spectra of OA PMF factors
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CaptureStandard
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Time series of PMF OA factors
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CaptureStandard
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Conclusions• Capture vaporizer works, CE ~1 !
• Need to recalibrate RIEs, O/C…• Slower evaporation, PToF ok for ambient• MS shifted to smaller fragments
• Still see same trends in VK diagram, Sally’s triangle
• Much higher signal at CO2+, H2O+
• Seem to lose f60, organic nitrates• Other tracers may still be usable
• Additional testing for SOAS, to be analyzed21