title: Selective solid-phase microextraction of explosives using fibers coated with the La(III) complex of p-di(4,4,5,5,6,6,6-heptafluoro-1,3-hexanedionyl)benzene.
abstract: This research demonstrates enhanced capture of explosives on polydimethylsiloxane (PDMS) solid-phase microextraction (SPME) fibers coated with a metal beta-diketonate polymer, [La(III) complex of p-di(4,4,5,5,6,6,6-heptafluoro-1,3-hexanedionyl)benzene, La(dihed)], compared to PDMS control fibers. SPME sampling was performed in an explosives bunker where the concentration of 2,4,6-trinitrotoluene (TNT) was estimated at less than 3parts-per-trillion (v/v). Analysis by gas chromatography/mass spectrometry showed an approximate 10-fold enhancement in the quantity of 2,4-dinitrotoluene captured on La(dihed) over the control fiber. La(dihed) sampling also resulted in a strong signal for TNT, whereas this explosive was well below the detection limit (1pg on fiber) on the control fiber.
authors.affiliation: Pacific Northwest National Laboratory, National Security Directorate, MSIN: P8-50, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352, USA. scott.harvey@pnl.gov
authors.forename: Scott D
authors.initials: SD
authors.lastname: Harvey
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry; D053834:Explosive Agents / Q000302:isolation & purification*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D009942:Organometallic Compounds / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000379:methods*; D014303:Trinitrotoluene / Q000302:isolation & purification; D005466:Fluorocarbons
chemical_list: D004129:Dimethylpolysiloxanes; D053834:Explosive Agents; D009942:Organometallic Compounds; D014303:Trinitrotoluene; C535113:(4-bis(4,4,5,5,6,6,6-heptafluoro-1,3-hexanedionyl)benzene)lanthanum(III); D005466:Fluorocarbons; C013830:baysilon