Emerging Continuous PM Measurement Technologies
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- Buddy Newton
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1 Emerging Continuous PM Measurement Technologies George Allen AWMA-OS Real-time PM Monitoring Workshop Toronto, ON October 20, 2011
2 Scope: New continuous aerosol methods suitable for routine network operation both PM2.5 and physical/chemical characterization in production or nearing production Not: conceptual stage products research instruments single particle speciation methods wet speciation (MARGA, PILS)
3 PM2.5 Nothing really new Products in the pipeline: variations on existing themes TAPI BAM [model 602] FRM-like MetOne BAM Thermo 1405xx TEOM
4 TAPI BAM model 602 FEM testing [almost?] finished Italian instrument adapted to US needs Dual-channel: PM2.5 and PM10 Channels closely matched same detector closely controlled flows 59-min hourly sample! Other nice features Expensive... See vendor presentation/exhibit
5 MetOne T-BAM Modification to existing 1020 FEM instrument retrofit process new round of FEM testing in progress Major changes: Teflon tape (was glass fiber) improved beta detectors and chamber geometry better moisture control compensation algorithms (P, T, moisture) Result: higher sensitivity [factor of 2 or more] reduced water interference no more nozzle fluff cleaning data should be more FRM-like
6 Low cost optical PM2.5 surrogate: Thermo (IH division): pdr-1500 Based on legacy MIE DR4 design ~4-5k USD; has chamber T/RH data, option for RH correction
7 Speciation Cooper XACT XRF Xact 620 ambient metals monitor shipping but still emerging limited independent evaluation not user friendly Some info: Washington U. at St. Louis 2010 AAAR presentation: Cooper/EPA-OAQPA 2010 presentation:
8 TAPI model 633 Aethalometer: Complete rebuild/redesign of classic Aethalometer by Magee Scientific TAPI now sole-source of Magee products Dual-sensor, multi-wavelength design 2 simultaneous measurements [2 spots] at different flows ==> different spot loading rates Near-realtime correction for spot loading artifact in theory - US patent app. # correction approach still evolving not yet demonstrated on ambient air Should ship late 2011
9 Magee/TAPI Next-Gen Model 633 Aethelometer - beta instrument
10 Model 633 Main Screen [v ]
11 UFP (particle # concentration down to 7 nm, up to 10^6/cc): TAPI Model 651 Ultrafine Particle Monitor aka TSI 3783 water CPC Best current commercial option for ambient particle # conc. several bumps in the road; some still not resolved SQAQMD (LA) / Phil Fine still not happy with it...
12 Realtime Woodsmoke Monitor Aethalometer Delta-C 2-channel model AE21 new application for existing instrument UVC minus BC = DC DC: very specific, semi-quantitative woodsmoke PM measurement Original work: 2004 Rutland, VT -- Unmix analysis shows ambient air DC response is only from WS Allen et al. DC * 10 = WS PM (µg/m 3 ) - generic scaling factor factor varies depending on source and age; 5 to infinity no DC response for photochemically aged aerosol same for levoglucosan! Ref: Evolution of Organic Aerosols in the Atmosphere, Jimenez, et al. Science (2009) DOI: /science
13 BAM PM2.5, UFP, BC, DC-WS May31-June 1, 2010 WS event, Boston
14 Boston wildfire WS event: 1-hour unscaled DC vs. BAM PM2.5 May 31-June 1, 2010 R2 = 0.96 PM/DC=16.4 Not collocated; PM2.5: avg. of 2 Boston sites DC: my office
15 WS DC caveats: must correct for spot loading saturation effect (masher tools) may not work well with model AE22 Aethalometer original work done with AE21 AE22 must be run with 3 spots/advance for DC measurement Other DC woodsmoke references: CT DEP WS report: Characterization of Valley Winter Woodsmoke Concentrations in Northern NY Using Highly Time-Resolved Measurements Allen, et al. Aerosol and Air Quality Research (2011) doi: /aaqr ; open access:
16 Nescaum WS kit: stand-alone WS PM monitoring field system System housed in Pelican case Self-contained, heated Sonic wind option
17 Inside view:
18 Questions/discussion...
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