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Journal article
Surface Emissions Modulate Indoor SVOC Concentrations through Volatility-Dependent Partitioning
ENVIRONMENTAL SCIENCE & TECHNOLOGY, v 54(11), pp 6751-6760
02 Jun 2020
PMID: 32379430
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Measurements by semivolatile thermal desorption aerosol gas chromatography (SV-TAG) were used to investigate how semivolatile organic compounds (SVOCs) partition among indoor reservoirs in (1) a manufactured test house under controlled conditions (HOMEChem campaign) and (2) a single-family residence when vacant (H2 campaign). Data for phthalate diesters and siloxanes suggest that volatility-dependent partitioning processes modulate airborne SVOC concentrations through interactions with surface-laden condensed-phase reservoirs. Airborne concentrations of SVOCs with vapor pressures in the range of C13 to C23 alkanes were observed to be correlated with indoor air temperature. Observed temperature dependencies were quantitatively similar to theoretical predictions that assumed a surface-air boundary layer with equilibrium partitioning maintained at the air-surface interface. Airborne concentrations of SVOCs with vapor pressures corresponding to C25 to C31 alkanes correlated with airborne particle mass concentration. For SVOCs with higher vapor pressures, which are expected to be predominantly gaseous, correlations with particle mass concentration were weak or nonexistent. During primary particle emission events, enhanced gas-phase emissions from condensed-phase reservoirs partitioned to airborne particles, contributing substantially to organic particulate matter. An emission event related to oven-usage was inferred to deposit siloxanes in condensed-phase reservoirs throughout the house, leading to the possibility of reemission during subsequent periods with high particle loading.
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Details
- Title
- Surface Emissions Modulate Indoor SVOC Concentrations through Volatility-Dependent Partitioning
- Publication Details
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, v 54(11), pp 6751-6760
- Publisher
- AMER CHEMICAL SOC; WASHINGTON
- Number of pages
- 0
- Grant note
- This work was supported by the Alfred P. Sloan Foundation Program on Chemistry of Indoor Environments via Grants G-2016-7050, G-2017-9944, and G-2019-11412. The authors thank the HOMEChem science team for a successful field campaign, Atila Novoselac and Steve Bourne for their operation of the UTest house, and Robin Weber for technical assistance. D.L. acknowledges support from the National Science Foundation (grant no. DGE 1752814). K.K. acknowledges support from the Carlsberg Foundation (grant no. CF16-0624). The authors thank the occupants of the H2 residence for participating in the study. The occupants of the H2 site gave informed consent for the study, which was conducted under a protocol approved in advance by the Committee for Protection of Human Subjects for the University of California, Berkeley (Protocol #2016 04 8656).
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000538420500032
- Scopus ID
- 2-s2.0-85085903808
- Other Identifier
- 991021860780004721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences