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Recalibration of DustTrak for Biomass Cookstove Emissions
Presented by: Julien CaubelPrepared by: Lamees Alkhamis
Sunday, January 31th 2016 ETHOS Conference 2016 – Kirkland, WA
Acknowledgements
We would like to thank our funders and donors
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PM2.5 Monitoring Device - DustTrak
• Criteria Pollutant regulated under NAAQS
• DustTrak commonly used to measure PM2.5 emitted from biomass
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Combustion of Biomass Produces PM2.[https://www.ctsweep.com/]
DustTrak DRX Aerosol Monitor Device[http://www.tsi.com/dusttrak]
Function Property
Concentration Range 0.001-150 mg/m3
Measurement Technique
Light Scattering
PM Size Detection PM1, PM2.5, Respirable/PM4, PM10/Thoracic
DustTrak Quantifies Aerosols By Light Scattering
Lamees Alkhamis - 4[http://www.tsi.com/]
Does DustTrak Actually Track?Motivation: obtain a calibration curve for DustTrak when
quantifying biomass cookstove emissions. Particle size is different as is scattering coefficient, hence need calibration
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Arizona Road Dust Aerosols[http://www.dust-control-inc.com/]
Vs.
Cookstove Biomass Aerosols[http://www.greenwayappliances.com/]
Using Unscented Incense Sticks to Obtain Calibration Curve
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0 100 200 300 400
Aver
age
Conc
entr
atio
n (p
artic
le/c
m3 )
Particle Diameter (nm)
FMPS Graph for 2 Incense Sticks with 3 Minutes Burn Time
Incense Sticks
BDS
Unscented Incense Sticks Burning Experimental Design
Lamees Alkhamis - 7Concurrently burned 5, 10, 15, and 20 sticks for 45 min
CycloneSampling
Probe Duct
Teflon Filter
Holder
Vacuum Pump
DustTrak Attached Directly
Berkeley Darfur Stove (BDS) Experimental Design
Lamees Alkhamis - 8Ran Cold Start of the WBT
Cyclone
Teflon Filter
Holder
Vacuum Pump
DustTrak Attached Directly
Sampling Probe Duct
Preliminary Unscented Incense Sticks PM2.5 Calibration Curve
Incense Sticks
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y = 0.403x + 0.317R² = 0.979
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0 5 10 15 20 25 30 35 40
Gra
vim
etric
PM
2.5
Conc
. (m
g/m
3 )
DustTrak PM2.5 Conc. (mg/m3)
5 Sticks
10 Sticks
15 Sticks
20 Sticks
Berkeley Darfur Stove (BDS) PM2.5Calibration Curve
y = 0.3014x + 2.173R² = 0.8912
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0 10 20 30 40 50
Gra
vim
etric
PM
2.5
Conc
. (m
g/m
3 )
DustTrak PM2.5 Conc. (mg/m3)
BDS
Cold Start
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Incense Sticks Closer to Linearity Compared to BDS
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0 5 10 15 20 25 30 35 40 45 50
Gra
vim
etric
PM
2.5
Conc
. (m
g/m
3 )
DustTrak PM2.5 Conc. (mg/m3)
IncenseSticksBDS
1:1 SlopeTrendline
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Incense Sticks and Cold Start
Future Work: Improving Design of Experiment • Make experiment time longer to assure more
deposition on filter Current range of deposition ~ 0.7 - 4 mg
• Produce various replicates of the incense stick experiments for further statistical analysis
• Use a wider range of concentrations with the incense sticks
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Project Summary • DustTrak is widely used in cookstoves research to
collect data on PM2.5 emissions from cookstoves, however, it is calibrated for larger particles of different reflectance (Arizona road dust)
• Calibration against the gold standard,( gravimetric filter) is necessary.
• We used both unimodal smoke from sticks and broad particulate size emissions from BDS to compare DustTrak estimates against gravimetric analysis Found that a correction factor of between 0.3 and 0.4 is needed
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