Photothermal Deflection Spectroscopy of Collected Aerosols

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Logan, Utah USA Elevation 4535 feet (1382 m) Population 42,670 (91,391 total valley) 80 miles from nearest population center- Salt Lake City ~ 250,000 popIndustry: AgricultureUp-wind: deserts- no industryAir Quality: Worst PM 2.5 in USA !– (Winter 2004/2005)Reason: Cars + Cows (NH 3 + HNO 3 → NH 4 NO 3 )– Some carbonaceous and sulfate aerosolsCurrent Analysis– Particle counting (laser scattering)– Particle collection and analysisUSA Today Posted 3/8/2005 4:04 PM“Northern Utah residents choke on bad air LOGAN, Utah (AP) — In thesummer, Cache Valley's verdant parks and riverside trails in theWasatch Range are a haven for outdoor enthusiasts who describe thisnorthern Utah mountain basin as a kind of Shangri-La.For about 40 days since November, at-risk residents like Koerner, 54— who make up 30% of the valley's population — have choked on anunrelenting pea soup of smoky haze, much of it belched by the enginesof the area's estimated 75,000 automobiles. …”
Laboratory-Based Condensed PhaseAerosol Measurements Aerosol Generation and Collection– Ammonium nitrate and Malathion (pesticide)– Germanium collection plate (2.5 cm diameter)– Free aerosol generator, no particle sizing/reforming Average aerosol ~ 2.0 μm m each with mass ~ 1.0 pg Surface coverage under 25% Photothermal Deflection Measurement– Pulsed infrared laser excitation (carbon dioxide 9.56 μm)– Helium-Neon probe laser with bi-cell position sensing electronics
Page 3 and 4: Chemical Analysis Perspective ofPho
Page 5 and 6: Apparatuses to DetectPhotothermal H
Page 7 and 8: Photothermal Detection: ComparisonC
Page 9 and 10: Further Considerations for Chemical
Page 11 and 12: Photothermal Detection of Condensed
Page 13: PM - Updated RulesUS EPA Fine Parti
Page 17 and 18: Aerosol / Particle Generation Nebul
Page 19 and 20: Aerosols Generation and SamplingAto
Page 21 and 22: Size and Number Calibration Aerosol
Page 23 and 24: IR Laser-Excited Photothermal Defle
Page 25 and 26: Aerosols Number Concentration100908
Page 27 and 28: So why are the detection limits so
Page 29 and 30: MOUDI Calibration CurveStage 6 (0.5
Page 31 and 32: Finite Element Analysis Modeling Fi
Page 33 and 34: Particle “Crowding” Effect Does
Page 35 and 36: Results for Substrate Thermal Condu
Page 37 and 38: Inference from Heat Transport and S
Page 39 and 40: Future Aerosol Work We need to us a
Page 41: Acknowledgements Several persons wo

Photothermal Deflection Spectroscopy of Collected Aerosols

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