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Advances in offline approaches for chemically speciated measurements of trace gas-phase organic compounds via adsorbent tubes in an integrated sampling-to-analysis system

Sheu, Roger and Marcotte, Aurelie and Khare, Peeyush and Charan, Sophia and Ditto, Jenna C. and Gentner, Drew R. (2018) Advances in offline approaches for chemically speciated measurements of trace gas-phase organic compounds via adsorbent tubes in an integrated sampling-to-analysis system. Journal of Chromatography A, 1575 . pp. 80-90. ISSN 0021-9673. http://resolver.caltech.edu/CaltechAUTHORS:20181126-080312568

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Abstract

Gas-phase organic compounds across a range of volatilities, including volatile organic compounds (VOCs), are key components of outdoor air, indoor spaces, and a variety of other anthropogenic and biogenic systems. The collection of offline samples on adsorbent-packed tubes for analysis on laboratory instrumentation has been in use for decades, but with limited sensitivities and compound coverage. We present and evaluate our integrated sampling-to-analysis system that enables offline detailed chemical characterization of multi-faceted organic mixtures at trace concentrations. Its capabilities extend across a diverse variety of VOCs with different molecular features, as well as intermediate and semivolatile organic compounds (I/SVOCs). Samples can be collected manually or via automated devices that have been applied in chamber, field, and aircraft platforms. The laboratory instrumentation can be coupled to both a high resolution mass spectrometer (MS) and a traditional quadrupole MS, though performance metrics presented in this study are determined via the traditional MS. We demonstrate capabilities for detailed chemical characterization and routine performance for a wide range of compound functionalities at sub-part per trillion (ppt) concentrations, and as low as <100 parts per quadrillion (ppq), yielding 3300 observed unique compound peaks in a single indoor air sample. These limits of detection and compound coverage were accomplished through a holistic optimization of the entire system and lifecycle of adsorbent tubes. We present our best practices for all aspects of tube production, handling, sampling, and analysis, and an examination of commercially-available materials and our custom adsorbent tubes using a diverse mix of VOC, IVOC, and SVOC standards, including difficult to measure analytes across a range of polarities and functionalities. In many aspects, the commercially-available materials and tube conditioners tested were insufficient for achieving low-ppt measurements.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.chroma.2018.09.014DOIArticle
ORCID:
AuthorORCID
Sheu, Roger0000-0001-7342-3790
Khare, Peeyush0000-0003-1078-1296
Charan, Sophia0000-0002-2023-6403
Additional Information:© 2018 Elsevier B.V. Received 7 July 2018, Revised 31 August 2018, Accepted 7 September 2018, Available online 10 September 2018.
Funders:
Funding AgencyGrant Number
NSFAWD0001666
Alexander von Humboldt-StiftungUNSPECIFIED
NSF Graduate Research FellowshipDGE-1122492
Alfred P. Sloan FoundationG-2015-14134
Subject Keywords:Volatile organic compounds (VOCs); Semivolatile organic compounds; Thermal desorption tubes; Trace gas analysis; Tenax TA
Record Number:CaltechAUTHORS:20181126-080312568
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181126-080312568
Official Citation:Roger Sheu, Aurelie Marcotte, Peeyush Khare, Sophia Charan, Jenna C. Ditto, Drew R. Gentner, Advances in offline approaches for chemically speciated measurements of trace gas-phase organic compounds via adsorbent tubes in an integrated sampling-to-analysis system, Journal of Chromatography A, Volume 1575, 2018, Pages 80-90, ISSN 0021-9673, https://doi.org/10.1016/j.chroma.2018.09.014. (http://www.sciencedirect.com/science/article/pii/S0021967318311610)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91145
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Nov 2018 17:48
Last Modified:26 Nov 2018 17:48

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