Analysis and monitoring of volatile analytes from aqueous solutions by extractions into the gas phase using microdialysis membranes and coupling to fast GC.
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.
Jones
Melissa A
MA
Department of Chemistry, University of St. Thomas, St. Paul, Minnesota 55105, USA.
Kramer
Ashley
A
Humbert
Matthew
M
Vanadurongvan
Tyler
T
Maurer
Jonathan
J
Bowser
Michael T
MT
Borgerding
Anthony J
AJ