Introduction to RMW Instruments

Introduction to RMW Instruments

Tom Henry RMW Company, Denver CO

Tony Hansen Magee Scientific Company, Berkeley CA

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Smoke and Exhaust: Aesthetic Impacts

Smoke & exhaust particles absorb and reflect sunlight, contributing to haze

Regional haze and visibility management important issues in West

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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

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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

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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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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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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

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Acknowledgments

Harvard School of Public HealthLawrence Berkeley National Laboratory

For further information

www.mageesci.com Representative

Tom Henry, RMW Company, (303) 388-0109