Reproducible vapor-time profiles using solid-phase microextraction with an externally sampled internal standard.
Determination of the dynamic nature of vapor/odor release has application in a wide variety of systems. This study applies automated solid-phase microextraction (SPME) utilizing an externally sampled internal standard (ESIS) to determine the vapor-time profile of odor delivery devices for three classes of explosive compounds. The profiles of delivery systems for target odorants 2,4-dinitrotoluene (2,4-DNT), 2-ethyl-1-hexanol (2-EH), and triacetone triperoxide (TATP) as canine training aids were compared over a period of 70 h. Strategies for evaluating the vapor-time profile of components with widely differing volatility are considered. An approach to quantifying the vapor concentration is described. The differences in the vapor-time profiles are examined and suggestions for selecting the best representative odor delivery technique are outlined.
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. william.maccrehan@nist.gov
William
W
MacCrehan
Stephanie
S
Moore
Michele
M
Schantz
D004129:Dimethylpolysiloxanes; D004136:Dinitrobenzenes / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D006573:Heterocyclic Compounds, 1-Ring / Q000032:analysis; D000441:Hexanols / Q000032:analysis; D009812:Odorants / Q000032:analysis*; D010545:Peroxides / Q000032:analysis; D012015:Reference Standards; D052617:Solid Phase Microextraction / Q000379:methods* / Q000592:standards*; D013696:Temperature
D004129:Dimethylpolysiloxanes; D004136:Dinitrobenzenes; D006573:Heterocyclic Compounds, 1-Ring; D000441:Hexanols; D010545:Peroxides; C495284:triacetone triperoxide; C013830:baysilon; C016403:2,4-dinitrotoluene; C034017:2-ethylhexanol