Fatemeh Maleki, Meghdad Payab, A. Baghban, H. Sheikhloie
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引用次数: 1
摘要
本课题采用涡流辅助表面活性剂增强乳化液-液微萃取(VSLLME)法,采用HPLC-PDA检测器(225nm)对葡萄干中氰戊菊酯的超痕量残留进行了测定。在VSLLME方法中,萃取溶剂通过涡流搅拌器分散到水样中。同时,加入表面活性剂作为乳化剂,可以提高水样向萃取溶剂的传质速率。考察了该方法的主要参数,确定了最佳提取条件:以氯苯20µL为提取溶剂,浓度为0.9 mmol。选择L-1CTAB作为表面活性剂,固定提取时间为60s,加入2%氯化钠,在室温下进行提取。在最佳条件下,检出限为0.3 ng mL-1。相对标准偏差(RSD, n=6)为2.87%。在0.3 ~ 100.0 ng mL-1的浓度范围内,呈5点线性关系。相关系数(R2)为0.9997,富集因子(EF)为114。最后,该方法已成功应用于实际样品中氰戊菊酯的测定。目标分析物在葡萄干样品中的回收率为84.13% ~ 92.12%。
Determination of Fenvalerate reside in raisin via vortex-assisted surfactant-enhanced emulsification liquid–liquid microextraction (VSLLME) method by using HPLC system
In this project, ultra-trace amounts of Fenvalerate residue in raisin, were determined via vortex-assisted surfactant-enhanced emulsification liquid–liquid micro extraction (VSLLME) method and by using HPLC-PDA detector at 225nm. In the VSLLME method, the extraction solvent is dispersed into the aqueous samples by assistance of vortex agitator. Meanwhile, the addition of a surfactant, which was used as an emulsifier, could enhance the rate of the mass-transfer from aqueous samples to the extraction solvent. The main parameters relevant to this method were investigated and the optimum conditions were established: 20 µL chlorobenzene was used as extraction solvent, 0.9 mmol.L-1CTAB was selected as the surfactant, the extraction time was fixed at 60s, 2% sodium chloride was added and the extraction process was performed under the room temperature. Under the optimum conditions, limit of detection (LOD) was 0.3 ng mL-1. The relative standard deviation (RSD, n=6) was 2.87%. The linearity was obtained by five points in the concentration range of 0.3 to 100.0 ng mL-1. Correlation coefficients (R2) was 0.9997, and the enrichment factor (EF) was 114. Finally, the proposed method has been successfully applied for determination of Fenvalerate in real samples. The recoveries of the target analyte in raisins samples were between 84.13% and 92.12%.
期刊介绍:
College & Research Libraries (C&RL) is the official scholarly research journal of the Association of College & Research Libraries, a division of the American Library Association, 50 East Huron St., Chicago, IL 60611. C&RL is a bimonthly, online-only publication highlighting a new C&RL study with a free, live, expert panel comprised of the study''s authors and additional subject experts.