TY - GEN
T1 - Comparison of the oxidative potential of size segregated aerosols of ambient origin in indoor and outdoor environments
AU - Yu, Haoran
AU - Zhao, Haoran
AU - Stephens, Brent
AU - Verma, Vishal
N1 - Publisher Copyright:
© 2018 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. All rights reserved.
PY - 2018
Y1 - 2018
N2 - The oxidative potential of size-segregated particulate matter (PM) samples collected inside and outside of an unoccupied apartment unit was measured based on a dithiothreitol (DTT) assay. The indoor PM mass was concentrated in the smaller size range (<0.5 µm), while outdoor PM was mostly in the larger sizes (1.5-7.0 µm). An overall higher (2-5 times) intrinsic DTT activity was observed for the indoor PM than outdoor for all size ranges, but the indoor/outdoor (I/O) ratio peaked at around 1.0 µm. In contrast, the volume-normalized DTT activity was higher for indoor samples than outdoor in smaller size range (<1 µm), but was similar for the coarse particles (2.5-10 µm). The results, consistent with penetration and deposition theory, indicate that the infiltration and persistence of outdoor PM concentrates mass in the ~0.1 to ~1 µm size range in the indoor environment. This may contribute to the substantial elevation of the intrinsic oxidative potential of indoor ambient PM.
AB - The oxidative potential of size-segregated particulate matter (PM) samples collected inside and outside of an unoccupied apartment unit was measured based on a dithiothreitol (DTT) assay. The indoor PM mass was concentrated in the smaller size range (<0.5 µm), while outdoor PM was mostly in the larger sizes (1.5-7.0 µm). An overall higher (2-5 times) intrinsic DTT activity was observed for the indoor PM than outdoor for all size ranges, but the indoor/outdoor (I/O) ratio peaked at around 1.0 µm. In contrast, the volume-normalized DTT activity was higher for indoor samples than outdoor in smaller size range (<1 µm), but was similar for the coarse particles (2.5-10 µm). The results, consistent with penetration and deposition theory, indicate that the infiltration and persistence of outdoor PM concentrates mass in the ~0.1 to ~1 µm size range in the indoor environment. This may contribute to the substantial elevation of the intrinsic oxidative potential of indoor ambient PM.
KW - Dithiothreitol assay
KW - I/O ratio
KW - Indoor PM
KW - Oxidative potential
KW - Size-segregated aerosol
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M3 - Conference contribution
AN - SCOPUS:85105643766
T3 - 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018
BT - 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018
PB - International Society of Indoor Air Quality and Climate
T2 - 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018
Y2 - 22 July 2018 through 27 July 2018
ER -