title: Development of imprinted materials for the selective extraction of nitroaromatic explosives.
abstract: Molecularly imprinted sorbents were synthesized and used as selective extraction sorbents for the analysis of nitroaromatic explosives. Their synthesis by radical polymerization using organic monomers and by sol-gel approach using organosilanes was considered to develop a selective sorbent. The sol-gel approach with phenyltrimethoxysilane (PTMS) as monomer and 2,4-dinitrotoluene (2,4-DNT) as template gave the most promising results. An optimized procedure adapted to the selective treatment of aqueous samples was then developed and applied to various target explosives. For the first time four nitroaromatic compounds were retained on the molecularly imprinted silica (MIS) with extraction recoveries between 29% and 81%, while only low recoveries were obtained on the non-imprinted sorbent, thus highlighting the high degree of selectivity. The MIS was then used for the clean-up of a sample containing motor oil spiked with 2,4-DNT and 2,4,6-trinitrotoluene (2,4,6-TNT). The results were compared with those obtained using a conventional sorbent (Oasis HLB). The cleanest chromatogram obtained using the MIS emphasized the high potential of the MIS as selective sorbent.
authors.affiliation: Laboratoire Environnement et Chimie Analytique (UMR PECSA ESPCI ParisTech-UPMC-CNRS 7195), Ecole Supérieure de Physique et Chimie Industrielles (ESPCI ParisTech), 10 rue Vauquelin, 75231 Paris, France.
authors.forename: Sonia
authors.initials: S
authors.lastname: Lordel
authors.forename: Florence
authors.initials: F
authors.lastname: Chapuis-Hugon
authors.forename: Véronique
authors.initials: V
authors.lastname: Eudes
authors.forename: Valérie
authors.initials: V
authors.lastname: Pichon
mesh_terms: D020106:Acrylamide / Q000737:chemistry; D004136:Dinitrobenzenes / Q000737:chemistry / Q000302:isolation & purification; D053834:Explosive Agents / Q000737:chemistry / Q000302:isolation & purification*; D008689:Methacrylates / Q000737:chemistry; D054802:Molecular Imprinting; D009578:Nitrobenzenes / Q000737:chemistry / Q000302:isolation & purification*; D017646:Organosilicon Compounds / Q000737:chemistry; D010578:Petroleum; D010851:Picrates / Q000737:chemistry / Q000302:isolation & purification; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction / Q000379:methods*; D014050:Toluene / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D004136:Dinitrobenzenes; D053834:Explosive Agents; D008689:Methacrylates; D009578:Nitrobenzenes; D017646:Organosilicon Compounds; D010578:Petroleum; D010851:Picrates; C008384:methacrylic acid; D020106:Acrylamide; C410706:phenyltrimethoxysilane; D014050:Toluene; C016403:2,4-dinitrotoluene; C005858:picric acid