Abstract
A simple and rugged solid-phase extraction (SPE) method for the determination of acidic herbicides, including phenoxyacetic acids, which are considered to be endocrine disruptors (EDs), was developed. Spiked tap-water and well-water samples were alkaline hydrolyzed with NaOH, followed by a simple SPE procedure using a hydrophilic-lipophilic balanced (HLB) copolymer. The hydrophilic character of a HLB copolymer allows packing a sufficient amount of hydrophilic property to prevent the wettability problems encountered with ODS and polystyrene packings. High and reproducible recoveries were obtained for both tap-water and well-water samples at a 0.4 μg/l spike level. For five replicate analyses using 75 ml of spiked water, the method detection limit (MDL) of UV-HPLC analysis was 0.040.18 μg/l.
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