Abstract/Details

Detection of explosive vapors from TNT buried in sand by gas chromatography and tunable electron energy monochromator-mass spectrometry using HS-SPME


2006 2006

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Abstract (summary)

The finding of buried explosives by detecting vapors emanating from explosives requires using a method that has high sensitivity and selectivity. In this work the results of an alternative methodology for explosive vapor detection based on GC-μECD is reported. A JEOL GCmate II - mass spectrometer coupled to a Tunable Electron Energy Monochromator (GC/TEEM-MS) was used for detected explosives identification. Both used the technique known as solid phase microextraction (SPME) in headspace (HS) mode to collect vapors above the samples. SPME is a simple technique that integrates sampling, extraction, concentration and sample introduction into a single step. Initially the optimum parameters for SPME were determined with the aim of obtain a high-quality extraction. The parameters were, type of SPME fiber, exposure time and desorption time in the port injection of the GC. HS-SPME procedure was carried out in samples with crystals of TNT buried in sand. These samples were analyzed under different environmental conditions such as temperature and water content. Analyses at several times after the TNT-soil mixture preparation were carried out during 1 month. Vapors of TNT and 2,4-DNT were found predominantly in the samples. HS-SPME coupled with GC-μ ECD and GC/TEEM-MS exhibited excellent selectivity and sensitivity.

Indexing (details)


Subject
Analytical chemistry
Classification
0486: Analytical chemistry
Identifier / keyword
Pure sciences
Title
Detection of explosive vapors from TNT buried in sand by gas chromatography and tunable electron energy monochromator-mass spectrometry using HS-SPME
Author
Baez-Angarita, Doris Bibiana
Number of pages
84
Publication year
2006
Degree date
2006
School code
0553
Source
MAI 44/03M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0542458802, 9780542458804
Advisor
Hernandez-Rivera, Samuel P.
University/institution
University of Puerto Rico, Mayaguez (Puerto Rico)
University location
United States -- Puerto Rico
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1431305
ProQuest document ID
304937677
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304937677
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