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Introduction to RMW Instruments
Tom Henry RMW Company, Denver CO
Tony Hansen Magee Scientific Company, Berkeley CA
22
Smoke and Exhaust: Aesthetic Impacts
Smoke & exhaust particles absorb and reflect sunlight, contributing to haze
Regional haze and visibility management important issues in West
33
Smoke and Exhaust: Listed Air Toxics
Toxic components Specific compounds require specific
chemical analyses Analyses cumbersome & expensive
Accompanying components may permit more rapid detection by optical means Black soot UV-absorbing material
44
Analytical Basis
Optically-absorbing material an indicator for diesel exhaust, wood- and tobacco smoke• “Black” carbon (‘BC’, ‘EC’)• “UV-absorbing material” (‘UVPM’)
Optical analysis is fast, sensitive, can be performed on-the-spot
55
Analytical Method– Optical Absorption
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Optical vs. Chemical Analyses: Ambient Air
“Six Cities Study”: Harvard School of Public Health
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Optical vs. Chemical Analyses: Tobacco Smoke
Tobacco Smoke Chamber Study - Respirable Suspended Particulates
vs. UV Aethalometer Data
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0 25 50 75 100 125 150
UV Aethalometer
RSP mass, ug/m
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Report published by Lawrence Berkeley National Laboratory
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Analytical Instrument: Aethalometer™
While continuously collecting sample, measures optical absorption in real time at 2 wavelengths (880 nm & 370 nm UV)
Converts optical absorption to mass concentration of BC and UVPM
Real-time data: 1 second / 1 minute / 1 hour
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Analytical Instrument : Aethalometer™
19-inch rack mount
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Analytical Instrument : Aethalometer™
Battery-powered ‘Portable’
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Fireplace Smoke
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Cigarette Smoke
Cigarette Smoke in small office: 1 week data overlay
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10000
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4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00
Local Time
UV Aethalometer, ng/m3
Smoking "prohibited" between 7 AM and 3:30 PM
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Agricultural-Burning Smoke
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Bus Yard Diesel Exhaust– Community Impact
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Diesel Indoors: Truck Enters Hall
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On the Bus in Boston
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In a Car in Boston
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Summary
Black carbon & UV-absorbing carbon indicate diesel exhaust, wood smoke, tobacco smoke
Aethalometer™ uses optical method to measure BC and UVPM in real time
Aethalometer on-the-spot data equivalent to standard chemical analyses
1919
Acknowledgments
Harvard School of Public HealthLawrence Berkeley National Laboratory
For further information
www.mageesci.com Representative
Tom Henry, RMW Company, (303) 388-0109