期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1359, 期 -, 页码 317-324出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.07.028
关键词
Beeswax; Capillary electrophoresis; Insecticides; Mass spectrometry; Neonicotinoids
资金
- Spanish Ministry Economia y Competitividad
- INIA [RTA2013-00042-C10-03]
- Spanish Ministry (Ramon y Cajal program)
- University of Valladolid
This paper represents the first report of a capillary electrophoresis (CE) method compatible with mass spectrometry (MS) detection for simultaneously analyzing seven neonicotinoid insecticides (acetamiprid, clothianidin, dinotefuran, imidacloprid, nitenpyram, thiacloprid and thiamethoxam). Different variables affecting CE separation (buffer concentration, pH, applied voltage and injection time) and MS detection (electrospray parameters) were studied. Low limits of detection (LOD) and quantification (LOQ) were achieved for all analytes, ranging from 1.0 to 2.3 mu g/L, and from 3.5 to 7.2 mu g/L, respectively. In addition, the proposed method showed itself to be linear in the range from LOQ to 1000 mu g/L and to be precise, as the relative standard deviations of the migration times were lower than 4% in all cases. Finally, the proposed CE-MS method was applied to assess the efficacy of a beeswax cleaning treatment with oxalic acid to remove residues of three of the most commonly used neonicotinoids (clothianidin, imidacloprid and thiamethoxam), use of which has recently been restricted by the European Union. (C) 2014 Elsevier B.V. All rights reserved.
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