HYBRID QUADRUPOLE TIME-OF-FLIGHT FOR THE DETERMINATION OF CHLOROPHENOLS IN SURFACE WATER BY LIQUID CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY

A QSTAR Pulsor quadrupole time-of-flight mass spectrometer was used for the determination of chlorophenols in surface water samples. The investigated compounds were: 2-chlorophenol; 4chloro-3-methylphenol; 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol. Each analyte is listed by the US-EPA as a priority pollutant. Sample enrichment of water samples was achieved by a solid-phase extraction procedure, using a Waters Oasis HLB cartridges followed by LC-Tandem-MS. A narrow-bore 2.1-mm-i.d. reversed phase LC C-18 column operating with a mobile phase flow rate of 0.2 mL min(-1). was used to separate the analytes. The whole column effluent was diverted to the ion spray interface source. For the determination of the analytes the hybrid quadrupole time-of-flight spectrometer operated in product ion scan acquisition mode. Average recoveries from 2 L samples varied from 91 to 110% and relative standard deviations (RSD) were less than 10% for all samples. The limit of defection (signal-to-noise ratio=3) of the method for the phenols in drinking water samples is less than 10 ng L-1. In real environmental samples, levels of the selected analytes varied from non-detected" up to 0.5 mug L-1 for pentachlorophenol.