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Large volume injection for the direct analysis of ionophores and avermectins in surface water by liquid chromatography-electrospray ionization tandem mass spectrometry |
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| Authors: | T.S. Thompson D.K. Noot J.P. van den Heever J. Keenliside |
| Affiliation: | a Alberta Agriculture and Rural Development, Food Safety Division, Agri-Food Laboratories Branch, 6909 - 116th Street, Edmonton, Alberta, Canada T6H 4P2 b Alberta Agriculture and Rural Development, Resource Management and Irrigation, Conservation and Development Branch, 7000 - 113th Street, Edmonton, Alberta, Canada T6H 5T6 c Alberta Agriculture and Rural Development, Food Safety Division, Agri-Food Systems Branch, 6909 - 116th Street, Edmonton, Alberta, Canada T6H 4P2 |
| Abstract: | 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 (20 mm) 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. |
| Keywords: | Ionophores Avermectins Surface water Liquid chromatography-tandem mass spectrometry On-line enrichment Monensin |
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