Journal
ANALYTICA CHIMICA ACTA
Volume 633, Issue 1, Pages 127-135Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2008.11.024
Keywords
Ionophores; Avermectins; Surface water; Liquid chromatography-tandem mass spectrometry; On-line enrichment; Monensin
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A simple method for the direct determination of residues of ionophore antibiotics and avermectin antiparasitics in surface water is reported. Using a large volume injector, a mixture of methanol and surface water is injected into an analytical liquid chromatography (LC) column and subsequently screened for residues of these veterinary pharmaceuticals using electrospray ionization tandem mass spectrometry. On-line sample enrichment and chromatographic separation are achieved using a single, short (20mm) octadecylsilane LC column. The method permits the detection Of four ionophores and two avermectins in surface water samples at low ng L(-1) concentrations. Minimal matrix effects were observed for a variety of surface water samples which permitted the use of reagent-based standards for quantitation. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
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