Comparison of Different Sorbents for Solid-Phase Extraction of Phenoxyalkanoic Acid Herbicides |
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Authors: | Magdalena Biesaga Anna Jankowska Krystyna Pyrzyńska |
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Affiliation: | (1) Department of Chemistry, University of Warsaw, Pasteura 1, PL-02-093 Warsaw, Poland |
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Abstract: | An HPLC procedure for determination of phenoxyalkanoic acid herbicides in water samples is proposed. The analytical column Phenomenex C18(2) Luna 5 µm and UV detection at 225 nm were applied. Baseline resolution was achieved in isocratic mode with a mobile phase consisting of acetonitrile/acetic acid (40/60, v/v), adjusted to pH 2.5. SPE sorbents – C18 BondElut, phenyl-silica, LiChrolut SAX and polymeric sorbents – were compared for isolation and preconcentration of 6 phenoxyalkanoic acid herbicides. Higher (above 95%) and more reproducible recoveries were obtained with polymeric and phenyl-silica sorbents using pure methanol for elution. The method was tested for river water samples with the limit of detection in the range of 2–3 µg L−1 (for 50 mL sample) and a reproducibility of 5% RSD. |
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Keywords: | : Chlorophenoxy acid herbicides solid-phase extraction water analysis. |
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