Detection of Trace Amounts of Explosives in the Presence of Lactic Acid by Ion Mobility Spectrometry

The effect of fingerprint sweat deposits on the detection efficiency of trace amounts of RDX, dinitronaphthalene, 2,4-dinitrotoluene, pentaerythritol tetranitrate, tetryl, 1,3,5-trinitrobenzene, trinitroresorcinol, 2,4,6-trinitrotoluene, and 2,4,6-trinitrophenol is studied by atmospheric pressure ch...

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Bibliographic Details
Published in:Journal of analytical chemistry (New York, N.Y.) N.Y.), 2022, Vol.77 (1), p.43-52
Main Authors: Buryakov, T. I., Buryakov, I. A.
Format: Article
Language:English
Subjects:
Acids
Adducts
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Efficiency
Explosives
Explosives detection
Fingerprints
Ionic mobility
Ionization
Ions
Lactic acid
Negative ions
PETN
Polyols
RDX
Scientific imaging
Spectrometry
Spectroscopy
Spectrum analysis
Sweat
Tetryl
Trinitrotoluene
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Summary:The effect of fingerprint sweat deposits on the detection efficiency of trace amounts of RDX, dinitronaphthalene, 2,4-dinitrotoluene, pentaerythritol tetranitrate, tetryl, 1,3,5-trinitrobenzene, trinitroresorcinol, 2,4,6-trinitrotoluene, and 2,4,6-trinitrophenol is studied by atmospheric pressure chemical ionization ion mobility spectrometry in the negative ion mode in air. Lactic (2-hydroxypropanoic) acid is the main component of the fingerprint that can possess this effect. The presence of lactic acid or a fingerprint in the sample does not significantly affect the efficiency of tetryl detection; although it changes the qualitative composition of pentaerythritol tetranitrate and RDX ions, causing the appearance of intense peaks in the spectrum, presumably, adducts of ions of these substances with lactic acid molecules, and dramatically impairs the efficiency of the formation of ions of other explosives. The limits of detection for trace amounts of RDX, dinitronaphthalene, 2,4-dinitrotoluene, pentaerythritol tetranitrate, tetryl, 1,3,5-trinitrobenzene, trinitroresorcinol, and 2,4,6-trinitrotoluene are 1, 2.5, 3, 4, 0.7, 5, 20, and 0.5 ng, and in the presence of a fingerprint with abundant sweat deposits, their values are 0.5, 2000, 1 × 10 5 , 2, 0.7, 5000, 300, and 100 ng, respectively. The limit of detection for 2,4,6-trinitrophenol is 30 ng; in the presence of a fingerprint, its value has not been determined.
ISSN:1061-9348
1608-3199
DOI:10.1134/S1061934821120030