Comparison of the oxidative potential of size segregated aerosols of ambient origin in indoor and outdoor environments

Haoran Yu, Haoran Zhao, Brent Stephens, Vishal Verma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publication15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018
PublisherInternational Society of Indoor Air Quality and Climate
ISBN (Electronic)9781713826514
StatePublished - 2018
Event15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018 - Philadelphia, United States
Duration: Jul 22 2018Jul 27 2018

Publication series

Name15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018

Conference

Conference15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018
Country/TerritoryUnited States
CityPhiladelphia
Period7/22/187/27/18

Keywords

  • Dithiothreitol assay
  • I/O ratio
  • Indoor PM
  • Oxidative potential
  • Size-segregated aerosol

ASJC Scopus subject areas

  • Pollution

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