Disks versus columns in the solid-phase extraction of pesticides from water
Abstract Forty four pesticides including organochlorine, organophosphorus, carbamate, triazine and other pesticide structures were extracted from distilled water spiked at 0.4 μg l −1 level using octyl- (C 8 ) and octadecyl-silica (C 18 ) based supports which are fixed on a PTFE membrane disk or hand-packed in glass minicolumns. Determination was carried out by capillary gas chromatography with an electron capture detector and a nitrogen-phosphorus selective detector operating in parallel. The analytical behaviour of C 8 and C 18 Empore membrane disks and C 8 and C 18 preparative Bondapak in glass minicolumns was studied on the basis of the statistical differences. On the whole, the minicolumns provided better recoveries than the disks, whereas with the same kind of support (disk or column), the results obtained with C 8 were close to those obtained with C 18 , except for carbamate and triazine pesticides in which the C 8 disks provided better recoveries than the C 18 ones. The theoretical and practical differences between the disks and columns were also examined.
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