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    Volume 45, Issue 3 (May 2017)

    Fourier Transform Infrared Absorption Spectroscopy for Quantitative Analysis of Gas Mixtures at Low Temperatures for Homeland Security Applications

    (Received 3 September 2015; accepted 15 February 2016)

    Published Online: 2017

    CODEN: JTEVAB

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    Abstract

    Performance standard specifications for point chemical vapor detectors are established in ASTM E2885-13 and ASTM E2933-13. The performance evaluation of the detectors requires the accurate delivery of known concentrations of the chemical target to the system under test. Referee methods enable the analyte test concentration and associated uncertainties in the analyte test concentration to be validated by independent analysis, which is especially important for reactive analytes. This work extends the capability of a previously demonstrated method for using Fourier transform infrared (FT-IR) absorption spectroscopy for quantitatively evaluating the composition of vapor streams containing hazardous materials at acute exposure guideline levels (AEGL) to include test conditions colder than laboratory ambient temperatures. The described method covers the use of primary reference spectra to establish analyte concentrations, the generation of secondary reference spectra suitable for measuring analyte concentrations under specified testing environments, and the use of additional reference spectra and spectral profile strategies to mitigate the uncertainties due to impurities and water condensation within the low-temperature (7°C, −5°C) test cell. Important benefits of this approach include verification of the test analyte concentration with characterized uncertainties by in situ measurements co-located with the detector under test, near-real-time feedback, and broad applicability to toxic industrial chemicals.


    Author Information:

    Meier, D. C.
    National Institute of Standards and Technology, Material Measurement Laboratory, Gaithersburg, MD

    Benkstein, K. D.
    National Institute of Standards and Technology, Material Measurement Laboratory, Gaithersburg, MD

    Hurst, W. S.
    National Institute of Standards and Technology, Material Measurement Laboratory, Gaithersburg, MD

    Chu, P. M.
    National Institute of Standards and Technology, Material Measurement Laboratory, Gaithersburg, MD


    Stock #: JTE20150382

    ISSN:0090-3973

    DOI: 10.1520/JTE20150382

    Author
    Title Fourier Transform Infrared Absorption Spectroscopy for Quantitative Analysis of Gas Mixtures at Low Temperatures for Homeland Security Applications
    Symposium ,
    Committee E54