title: Toward in situ monitoring of water contamination by nitroenergetic compounds.
abstract: We have previously described the application of novel porous organosilicate materials to the preconcentration of nitroenergetic targets from aqueous solution prior to HPLC analysis. The performance of the sorbents and the advantages of these types of materials over commercially available solid phase extraction sorbents have been demonstrated. Here, the development of systems for application of those sorbents to in situ monitoring is described. Considerations such as column pressure, particulate filtration, and component durability are discussed. The diameter of selected column housings, the sorbent bed depth, and the frits utilized significantly impact the utility of the sorbent columns in the prototype system. The impact of and necessity for improvements in the morphological characteristics of the sorbents as they relate to reduction in column pressure are detailed. The results of experiments utilizing a prototype system are presented. Data demonstrating feasibility for use of the sorbents in preconcentration prior to ion mobility spectrometry is also presented.
authors.affiliation: Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA. brandy.white@nrl.navy.mil
authors.forename: Brandy J
authors.initials: BJ
authors.lastname: Johnson
authors.forename: Iwona A
authors.initials: IA
authors.lastname: Leska
authors.forename: Alejandro
authors.initials: A
authors.lastname: Medina
authors.forename: Norris F
authors.initials: NF
authors.lastname: Dyson
authors.forename: Mansoor
authors.initials: M
authors.lastname: Nasir
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Melde
authors.forename: Jenna R
authors.initials: JR
authors.lastname: Taft
authors.forename: Paul T
authors.initials: PT
authors.lastname: Charles
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004784:Environmental Monitoring; D008855:Microscopy, Electron, Scanning; D017672:Nitrogen Compounds / Q000032:analysis*; D052616:Solid Phase Extraction; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D017672:Nitrogen Compounds; D014874:Water Pollutants, Chemical