title: Solid-phase extraction using hierarchical organosilicates for enhanced detection of nitroenergetic targets.
abstract: A novel porous organosilicate material was evaluated for application as a solid phase extraction sorbent for preconcentration of nitroenergetic targets from aqueous solution prior to HPLC analysis. The performance of the sorbent in spiked deionized water, groundwater, and surface water was evaluated. Targets considered included 2,4,6-trinitrotoluene, 2,4-dinitrotoluene, RDX, HMX, and nitroglycerin. The sorbent was shown to provide improved performance over Sep-Pak RDX. The impact of complex matrices on target preconcentration by the sorbent was also found to be less dramatic than that observed for LiChrolut EN. The impact of changes in pH on target preconcentration was considered. Aqueous soil extracts generated from samples collected at sites of ordnance testing were also used to evaluate the materials. The results presented here demonstrate the potential of this novel sorbent for application as a solid phase extraction material for the preconcentration of nitroenergetic targets from aqueous solutions.
authors.affiliation: Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC, USA. brandy.white@nrl.navy.mil
authors.forename: Brandy J
authors.initials: BJ
authors.lastname: Johnson
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Melde
authors.forename: Iwona A
authors.initials: IA
authors.lastname: Leska
authors.forename: Paul T
authors.initials: PT
authors.lastname: Charles
authors.forename: Alan D
authors.initials: AD
authors.lastname: Hewitt
mesh_terms: D001392:Azocines / Q000032:analysis / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004136:Dinitrobenzenes / Q000032:analysis / Q000737:chemistry; D053834:Explosive Agents / Q000032:analysis* / Q000737:chemistry; D005618:Fresh Water / Q000737:chemistry; D017672:Nitrogen Compounds / Q000032:analysis* / Q000737:chemistry; D005996:Nitroglycerin / Q000032:analysis / Q000737:chemistry; D017646:Organosilicon Compounds / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D014227:Triazines / Q000032:analysis / Q000737:chemistry; D014303:Trinitrotoluene / Q000032:analysis / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D001392:Azocines; D004136:Dinitrobenzenes; D053834:Explosive Agents; D017672:Nitrogen Compounds; D017646:Organosilicon Compounds; D014227:Triazines; D014874:Water Pollutants, Chemical; D014303:Trinitrotoluene; D005996:Nitroglycerin; C023514:2,6-dinitrotoluene; C007950:octogen; C009160:cyclonite