Analysis of off-flavors in the aquatic environment by stir bar sorptive extraction-thermal desorption-capillary GC/MS/olfactometry.
The off-flavor compounds 2-methylisoborneol (MIB), geosmin, 2,4,6-trichloroanisole, 2,3,6-trichloroanisole, 2,3,4-trichloroanisole, and 2,4,6-tribromoanisole were analyzed in water samples by stir bar sorptive extraction (SBSE) followed by on-line thermal desorption (TD) capillary GC/MS. Quantification was performed using the MS in the single-ion-monitoring mode (SIM) with 2,4,6-trichloroanisole-D(5 )as internal standard. Quantification limits are 0.1-0.2 ng L(-1) for the haloanisoles, 0.5 ng L(-1) for geosmin, and 1 ng L(-1) for MIB. The relative standard deviations at the quantification limit ranged from 7 to 14.6%. SBSE recovery was evaluated by spiking real water samples and varied from 87 to 117%. More than twenty samples per day can be analyzed by SBSE-TD-capillary GC-MS. The same technique in combination with olfactometry was used to elucidate unknown odorous compounds in water samples.
Analytical Research Department, Anjou Recherche, 1 place de Turenne, 94417 Saint-Maurice, France. david.benanou@generale-des-eaux.net
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D000840:Anisoles / Q000032:analysis; D002138:Calibration; D001892:Camphanes / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009284:Naphthols / Q000032:analysis; D009812:Odorants / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013649:Taste; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply
D000840:Anisoles; D001892:Camphanes; D009284:Naphthols; D014874:Water Pollutants, Chemical; C005536:2-methylisoborneol; C110228:2,4,6-trichloroanisole; C001278:geosmin