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Abstract
A new very porous polystyrene-divinylbenzene copolymer with large surface area as an adsorber for solid-phase extraction (SPE), was used for the analyses of terbuthylazine and principal degradates. It showed good recovery rates even for the dealkylated hydroxy metabolites. The polymer was treated similarly to a reversed-phase material, sample of 1000 ml showed no breakthrugh for most of the terbuthylazine degradates. A detection limit of 0.1 μg/l could be reached even for the most polar compounds (de- tert-butyldeethylterbuthylazine and de- tert-butylhydroxyterbuthylazine) with recovery rates of 22 and 30%. Percolated water and soil extracts from column experiments, obtained with water and methanol, were analysed using the copolymer sorbent. Analyses were performed on a HPLC system with UV-Vis detection and a scintillation counter. The compounds were separated on a RP-8 column with an acetonotrile-phosphate-buffer gradient. In addition to terbuthylazine applied 2 months prior to extraction, deethyl- and hydroxyterbuthylazine were detected in the soil extracts; de- tert-butylterbuthylazine was found only in traces.
Published Version
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