TY - JOUR
T1 - Yellow Beads and Missing Particles
T2 - Trouble Ahead for Filter-Based Absorption Measurements
AU - Subramanian, R.
AU - Roden, Christoph A.
AU - Boparai, Poonam
AU - Bond, Tami C.
N1 - Funding Information:
We thank Scott J. Robinson of the Beckman Institute for assistance with the microscopy, and helpful discussions. This work was funded by EPA STAR Grant RD-83108501 and NSF ATM-0349282. This paper has not been subjected to EPA’s required peer and policy review and therefore does not necessarily reflect the views of the Agency. No official endorsement should be inferred.
PY - 2007/5/3
Y1 - 2007/5/3
N2 - Particulate emissions from low-temperature biomass burning are dominated by organic matter. Here, we show that such emissions have a liquid, bead-like appearance when collected on fibrous filters, and the number of these beads are far less than expected for solid spherical particles. These shapes are in line with published drop-on-fiber theories for liquids entrained on filaments. A smoldering pine sample is yellowish, with organic carbon over 99% of the total carbon, and chars substantially in thermal-optical analysis (TOA), indicating that such liquid organic particles could affect both absorption measurements and TOA of such samples. Similar colored samples collected in the field from rice-straw burning and cook stove emissions also show a similar liquid appearance.
AB - Particulate emissions from low-temperature biomass burning are dominated by organic matter. Here, we show that such emissions have a liquid, bead-like appearance when collected on fibrous filters, and the number of these beads are far less than expected for solid spherical particles. These shapes are in line with published drop-on-fiber theories for liquids entrained on filaments. A smoldering pine sample is yellowish, with organic carbon over 99% of the total carbon, and chars substantially in thermal-optical analysis (TOA), indicating that such liquid organic particles could affect both absorption measurements and TOA of such samples. Similar colored samples collected in the field from rice-straw burning and cook stove emissions also show a similar liquid appearance.
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U2 - 10.1080/02786820701344589
DO - 10.1080/02786820701344589
M3 - Article
AN - SCOPUS:85012492683
SN - 0278-6826
VL - 41
SP - 630
EP - 637
JO - Aerosol Science and Technology
JF - Aerosol Science and Technology
IS - 6
ER -