title: Analysis and monitoring of volatile analytes from aqueous solutions by extractions into the gas phase using microdialysis membranes and coupling to fast GC.
abstract: Microdialysis membranes (3 mm lengthx200 microm i.d.) have been used to extract volatile analytes from aqueous samples into the gas phase and interfaced with fast gas chromatography. Gas-phase extracts generated from aqueous samples reach steady-state concentrations and are transported to the detector in 5 s. The recovery of the system ranges from 1.28% for toluene to less than 0.1% for ethanol. The lowest detectable concentration without preconcentration was 5 mM for most compounds using a flame ionization detector, and as low as 0.01 mM for more volatile hydrophobic analytes. When interfaced with a fast GC system, changes in aqueous phase concentrations were monitored with a temporal resolution of 10 s.
authors.affiliation: Department of Chemistry, University of St. Thomas, St. Paul, Minnesota 55105, USA.
authors.forename: Melissa A
authors.initials: MA
authors.lastname: Jones
authors.forename: Ashley
authors.initials: A
authors.lastname: Kramer
authors.forename: Matthew
authors.initials: M
authors.lastname: Humbert
authors.forename: Tyler
authors.initials: T
authors.lastname: Vanadurongvan
authors.forename: Jonathan
authors.initials: J
authors.lastname: Maurer
authors.forename: Michael T
authors.initials: MT
authors.lastname: Bowser
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Borgerding