期刊
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
卷 1031, 期 -, 页码 15-28出版社
ELSEVIER
DOI: 10.1016/j.jchromb.2016.06.020
关键词
MS/MS; QuEChERS; Neonicotinoids; Cucumber; Soil; Metabolites
资金
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain Shams University
- Department of Chemistry, Humboldt-Universitat zu Berlin, Berlin, Germany
A new, rapid, sensitive, precise and validated high performance liquid chromatography coupled to tandem mass spectrometry (HPLC-MS/MS) method was developed for the simultaneous determination of eight neonicotinoid insecticides with their two primary metabolites in cucumbers and soil based on QuEChERS as a pretreatment procedure. In QuEChERS procedure, cucumber samples were extracted with acetonitrile and cleaned using (C18 sorbent material), while soil samples were extracted with a mixture of acetonitrile:dichloromethane (8.3:16.7 v:v). The LC-MS/MS conditions were optimized to provide good selectivity and specificity of the developed method where neonicotinoids were separated using gradient elution of water and acetonitrile both containing 0.1% formic acid with Gemini C18 column where the last compound was eluted at 9.5 min. Average recoveries of the eight neonicotinoids and their metabolites ranged between 81.6% and 95.7% in fortified cucumber samples with relative standard deviations (RSDs) lower than 13.18% and between 80.3% and 104% in fortified soil samples with relative standard deviations (RSDs) lower than 8.44%. The limits of detection (LODs) and quantification (LOQs) for the ten compounds were in the ranges of (0.08-6.06 ng/g) and (0.26-20 ng/g), respectively. The method was applied successfully to determine residues and rate of disappearance of the eight neonicotinoids from cucumber and soil and their half-lives where a safety pre-harvest interval of 5 days for acetampirid, 12 days for imidacloprid, 15 days for nitenpyram, 12 days for thiamethoxam, 5 days for flonicamid, 8 days for clothianidin, 2 days for Dinotefuran, and 1 day for thiacloprid were suggested. (C) 2016 Elsevier B.V. All rights reserved.
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