AIHce 2002 San Diego, CA

Introduction to
RMW Instruments
Tom Henry
RMW Company, Denver CO
Tony Hansen
Magee Scientific Company, Berkeley CA
Smoke and Exhaust: Aesthetic
Impacts
Smoke & exhaust particles
absorb and reflect sunlight,
contributing to haze
Regional haze and visibility
management important issues in
West
2
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
3
Analytical Basis
Optically-absorbing material an
indicator for diesel exhaust, woodand tobacco smoke
•
•
“Black” carbon (‘BC’, ‘EC’)
“UV-absorbing material” (‘UVPM’)
Optical analysis is fast, sensitive, can
be performed on-the-spot
4
Analytical Method–
Optical Absorption
5
Optical vs. Chemical
Analyses: Ambient Air
“Six Cities Study”: Harvard School of Public Health
6
Optical vs. Chemical Analyses:
Tobacco Smoke
RSP mass, ug/m
3
Tobacco Smoke Chamber Study Respirable Suspended Particulates
vs. UV Aethalometer Data
1000
900
800
700
600
500
400
300
200
100
0
0
25
50
75
100
125
150
UV Aethalometer
Report published by Lawrence Berkeley National Laboratory
7
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
8
Analytical Instrument :
Aethalometer™
19-inch rack mount
9
Analytical Instrument :
Aethalometer™
Batterypowered
‘Portable’
10
Fireplace Smoke
11
Cigarette Smoke
Cigarette Smoke in small office: 1 week data overlay
Smoking "prohibited" between 7 AM and 3:30 PM
50000
UV Aethalometer, ng/m3
40000
30000
20000
10000
0
4:00
6:00
8:00
10:00
12:00
Local Time
14:00
16:00
18:00
20:00
12
Agricultural-Burning Smoke
13
Bus Yard Diesel Exhaust–
Community Impact
14
Diesel Indoors:
Truck Enters Hall
15
On the Bus in Boston
16
In a Car in Boston
17
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
18
Acknowledgments
Harvard School of Public Health
Lawrence Berkeley National Laboratory
For further information
www.mageesci.com
Representative
Tom Henry, RMW Company,
(303) 388-0109
19