Determination of benzenes and naphthalenes in water by purge and trap isolation and capillary column chromatography.
A method for determination of volatile, aromatic hydrocarbons in the range from benzene to C2-naphthalenes has been adapted for monitoring the concentration of these components in water. The hydrocarbons are purged from the water by helium, trapped on an adsorbent, Tenax-GC, desorbed from this by rapid heating, transferred directly to a fused-silica gas chromatography column, which is cooled to -80 degrees C for initial cryotrapping, and finally chromatographed by programmed raising of the temperature of the column. The whole process is automated and takes 40 min, plus 10 min for temperature equilibration for the next experiment. With 5 ml water samples, concentrations of 0.1 microgram/l (ppb) of the individual components were determined. The method was applied to monitoring of a biotest system, and compared to the traditional liquid extraction method.
Barnung
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TN
Department of Chemistry, University of Bergen, Norway.
Grahl-Nielsen
O
O
D001554:Benzene / Q000032:analysis*; D001555:Benzene Derivatives / Q000032:analysis*; D002849:Chromatography, Gas; D009281:Naphthalenes / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D001555:Benzene Derivatives; D009281:Naphthalenes; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D001554:Benzene