中文摘要：本文开发了一个二元溶剂型离子液体辅助表面活性剂强化乳化微萃取法，用于分离和富集苹果汁和苹果醋中四种杀菌剂（嘧霉胺、咯菌腈、嘧菌环胺、唑菌胺酯）。本文选择密度低于水的非氯化溶剂乙酸戊酯作为萃取溶剂，选择高密度低毒性的1-己基-3-甲基咪唑六氟磷酸盐离子液体作为二次溶剂，两者混合离心后，在管底沉积了高密度二元溶剂。本文还考察了萃取溶剂种类、离子液体比、混合溶剂体积、表面活性剂的种类和浓度、样品ph值、氯化钠浓度、涡流时间等对萃取物萃取效率的影响。在优化条件下，该方法提供了良好的线性范围，为5-200μg/L；定量限在2-5μg/L范围，日间测定的相对标准偏差在1.7-11.9%范围内。该方法被应用于检测苹果汁和苹果醋中四种杀菌剂（嘧霉胺、咯菌腈、嘧菌环胺、唑菌胺酯），并通过回收实验证明了其准确性。
外文摘要：A binary-solvent-based ionic-liquid-assisted surfactant-enhanced emulsification microextraction method was developed for the separation/preconcentration and determination of four fungicides (pyrimethanil, fludioxonil, cyprodynil, pyraclostrobin) in apple juice and apple vinegar. A nonchlorinated solvent amyl acetate, which has a lower density than water, was used as the extraction solvent, and an ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate, which has a high density and low toxicity, was used as a secondary solvent mixed with the extraction solvent. After centrifugation, the binary solvent drop with a relatively high density was deposited on the bottom of the tube. Some parameters influencing the extraction efficiency of analytes such as type of extraction solvent, ratio of ionic liquid, volume of mixed solvent, type and concentration of surfactant, sample pH, NaCl concentration, and vortex time were investigated and optimized. Under the optimized conditions, the proposed method provided a good linearity in the range of 5-200 mu g/L. The limits of quantification of the method were in the range of 2-5 mu g/L. The relative standard deviations for interday assays were 1.7-11.9%. The method was applied to the determination of pyrimethanil, fludioxonil, cyprodynil, and pyraclostrobin in apple juice and apple vinegar samples, and the accuracy was evaluated through recovery experiments.
外文关键词：binary solvent, emulsification microextraction, fungicides, ionic liquids, surfactants
作者：Chen, Xiaochu; Zhang, Xu; Liu, Fengmao; Hou, Fan
作者单位：China Agr Univ, Coll Sci, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China.
期刊名称：JOURNAL OF SEPARATION SCIENCE
期刊影响因子：2.741
出版年份：2017
出版刊次：2
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