title: Development of a home-made extraction device for vortex-assisted surfactant-enhanced-emulsification liquid-liquid microextraction with lighter than water organic solvents.
abstract: We have developed a novel vortex-assisted surfactant-enhanced-emulsification liquid-liquid microextraction using the low density solvent for the determination of eight organophosphorus pesticides (OPPs) in water samples. The key point of this method is the application of a special home-made extraction device. The influence parameters relevant to this method were systemically investigated and the optimum conditions were as follow: 35μL of toluene was used as extraction solvent and 0.2mmol L-1 Triton X-100 was chosen as the surfactant to enhance the emulsification. Under the optimum experimental conditions, the limit of detections (LODs) of the method was ranged between 0.01 and 0.05μgL(-1) and the relative standard deviations (RSDs) were 2.9-8.1%. The calibration curve was linear in the range of 0.1-50.0μgL(-1), with the correlation coefficients (r) varying from 0.9949 to 0.9991. Finally, the developed method has been successfully applied to the determination of eight organophosphorus pesticides in river, reservoir and well water samples with recoveries between 82.1% and 98.7%.
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Beijing 100193, China.
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Yang
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Wen-ting
authors.initials: WT
authors.lastname: Zhao
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Zhou
authors.forename: Dong-Hui
authors.initials: DH
authors.lastname: Liu
mesh_terms: D002849:Chromatography, Gas; D005618:Fresh Water / Q000737:chemistry; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000295:instrumentation* / Q000379:methods*; D017830:Octoxynol / Q000737:chemistry; D063086:Organothiophosphates / Q000032:analysis / Q000302:isolation & purification; D009994:Osmolar Concentration; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D014050:Toluene / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
chemical_list: D063086:Organothiophosphates; D012997:Solvents; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014050:Toluene; D017830:Octoxynol
keywords: Gas chromatography; Liquid–liquid microextraction; Reservoir; River; Well water