Solid-phase extraction of polar pesticides from environmental water samples on graphitized carbon and Empore-activated carbon disks and on-line coupling to octadecyl-bonded silica analytical columns

Journal of Chromatography. a
J SlobodníkU A Brinkman

Abstract

The suitability of Empore-activated carbon disks (EACD), Envi-Carb graphitized carbon black (GCB) and CPP-50 graphitized carbon for the trace enrichment of polar pesticides from water samples was studied by means of off-line and on-line solid-phase extraction (SPE). In the off-line procedure, 0.5-2 l samples spiked with a test mixture of oxamyl, methomyl and aldicarb sulfoxide were enriched on EnviCarb SPE cartridges or 47 mm diameter EACD and eluted with dichloromethane-methanol. After evaporation, a sample was injected onto a C18-bonded silica column and analysed by liquid chromatography with ultraviolet (LC-UV) detection. EACD performed better than EnviCarb cartridges in terms of breakthrough volumes (> 2 l for all test analytes), reproducibility (R.S.D. of recoveries, 4-8%, n = 3) and sampling speed (100 ml/min); detection limits in drinking water were 0.05-0.16 microgram/l. In the on-line experiments, 4.6 mm diameter pieces cut from original EACD and stacked onto each other in a 9 mm long precolumn, and EnviCarb and CPP-50 packed in 10 x 2.0 mm I.D. precolumn, were tested, and 50-200 ml spiked water samples were preconcentrated. Because of the peak broadening caused by the strong sorption of the analytes on carbon, the car...Continue Reading

Citations

May 20, 2006·Analytical and Bioanalytical Chemistry·Marta VillagrasaDamià Barceló
Aug 30, 2008·Analytical and Bioanalytical Chemistry·Hong Yun NiuGui Bin Jiang
Jun 11, 2008·Nanotechnology·C Raman SuriGajendra S Shekhawat
Feb 7, 1997·Journal of Chromatography. B, Biomedical Sciences and Applications·H Lingeman, S J Hoekstra-Oussoren
Jan 23, 2004·Journal of Chromatography. a·Joanna RychłowskaZenon Lukaszewski

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