Detection of chemical agents in the atmosphere by open-path FT-IR spectroscopy under conditions of background interference: I. High-frequency flashes

Open-path FT-IR spectra were measured while fireworks were emitting smoke and incandescent particles into the infrared beam. These conditions were designed to simulate the appearance of smoke and explosions in a battlefield. Diethyl ether was used to simulate the vapor-phase spectra of G agents such...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2010-06, Vol.397 (4), p.1511-1519
Main Authors: Shao, Limin, Roske, Christopher W, Griffiths, Peter R
Format: Article
Language:English
Subjects:
Analytical Chemistry
Atmosphere - analysis
Atmospheres
Battlefield clutter
Biochemistry
Characterization and Evaluation of Materials
Chemical Warfare Agents - analysis
Chemical weapons
Chemistry
Chemistry and Materials Science
Ether - analysis
Exact sciences and technology
Fireworks
Food Science
G agents
Infrared spectroscopy
Interference
Laboratory Medicine
Mathematical analysis
Monitoring/Environmental Analysis
Open-path FT-IR spectrometry
Original Paper
PLS regression
Spectrometric and optical methods
Spectroscopy, Fourier Transform Infrared
Spectrum analysis
Target factor analysis
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Summary:Open-path FT-IR spectra were measured while fireworks were emitting smoke and incandescent particles into the infrared beam. These conditions were designed to simulate the appearance of smoke and explosions in a battlefield. Diethyl ether was used to simulate the vapor-phase spectra of G agents such as sarin. The measured interferograms were corrected by a high-pass filter and were rejected when interfering features were of such high frequency that they could not be removed by application of this filter. The concentration of diethyl ether was calculated correctly by partial least squares regression in the absence of fireworks but significant errors were encountered when the spectra of the oxide particles were not included in the calibration set. Target factor analysis allowed the presence of the analyte to be detected even when the incandescent particles were present in the beam.
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-010-3690-z