Journal article
Emerging investigator series: chemical and physical properties of organic mixtures on indoor surfaces during HOMEChem
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS, v 23(4), pp 559-568
01 Apr 2021
PMID: 33870396
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Organic films on indoor surfaces serve as a medium for reactions and for partitioning of semi-volatile organic compounds and thus play an important role in indoor chemistry. However, the chemical and physical properties of these films are poorly characterized. Here, we investigate the chemical composition of an organic film collected during the HOMEChem campaign, over three cumulative weeks in the kitchen, using both Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) and offline Aerosol Mass Spectrometry (AMS). We also characterize the viscosity of this film using a model based on molecular formulas as well as poke-flow measurements. We find that the film contains organic material similar to cooking organic aerosol (COA) measured during the campaign using on-line AMS. However, the average molecular formula observed using FT-ICR MS is similar to C50H90O11, which is larger and more oxidized than fresh COA. Solvent extracted film material is a low viscous semisolid, with a measured viscosity <10(4) Pa s. This is much lower than the viscosity model predicts, which is parametrized with atmospherically relevant organic molecules, but sensitivity tests demonstrate that including unsaturation can explain the differences. The presence of unsaturation is supported by reactions of film material with ozone. In contrast to the solvent extract, manually removed material appears to be highly viscous, highlighting the need for continued work understanding both viscosity measurements as well as parameterizations for modeled viscosity of indoor organic films.
Metrics
Details
- Title
- Emerging investigator series: chemical and physical properties of organic mixtures on indoor surfaces during HOMEChem
- Publication Details
- ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS, v 23(4), pp 559-568
- Publisher
- ROYAL SOC CHEMISTRY; CAMBRIDGE
- Number of pages
- 9
- Grant note
- We thank the HOMEChem science team and Delphine Farmer and Marina Vance for all the work carried out to design and run the experiments during the campaign. The authors thank Michael Wade and Richard L. Corsi for collecting glass samples, and Atila Novoselac for RH and T measurements. We thank the Alfred P. Sloan Foundation for support G-2018-11031 (R. E. O.); G-2019-12306 and G-2020-13912 (M. S.); G-2020-12675 (V. H. G.); G-2019-12301 (P. F. D.). R. E. O. thanks Dr Deepti Varma and COSMIC (College of Sciences Major Instrumentation Cluster) for FT-ICR data, Jesse H. Kroll for HR-AMS access, and Hannah Przelomski for assistance in extracting the sample, A. K. B. and K. K. thank the Natural Science and Engineering Research Council of Canada (grant RGPIN/04315-2014).
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000640985000001
- Scopus ID
- 2-s2.0-85105179368
- Other Identifier
- 991021860669804721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Analytical
- Environmental Sciences