Determination of triorganotin species in water samples by liquid chromatography-electrospray-mass spectrometry.
Liquid chromatography coupled to electrospray-mass spectrometry (LC-ES-MS) with positive ion detection was evaluated for the determination of tributyltin and triphenyltin in water samples using tripropyltin as internal standard. The separation was performed in the isocratic mode on a silica-based C18 column with a mobile phase containing 0.02% trifluoroacetic acid in acetonitrile-water (50:50, v/v). The optimum LC-ES-MS conditions were established and quantification was performed on the basis of the [M]+ ions. Limits of detection for standard solutions were 100 and 200 pg Sn injected for triphenyltin and tributyltin, respectively, and good reproducibility was observed. Solid-phase extraction was carried out on C18 cartridges to preconcentrate the analytes from natural water samples, with recoveries ranging from 80 to 110%. Limits of detection for SPE-LC-ES-MS were in the range of low ng l(-1), which demonstrates the suitability of the method for environmental samples.
González-Toledo
Encarna
E
Departament de Química Analítica, Universitat de Barcelona, Spain.
Compañó
Ramón
R
Prat
Maria Dolors
MD
Granados
Mercè
M
D002853:Chromatography, Liquid / Q000379:methods*; D009947:Organotin Compounds / Q000032:analysis*; D012015:Reference Standards; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D009947:Organotin Compounds; D014874:Water Pollutants, Chemical