title: Dispersive liquid-liquid microextraction combined with ultrahigh performance liquid chromatography/tandem mass spectrometry for determination of organophosphate esters in aqueous samples.
abstract: A new technique was established to identify eight organophosphate esters (OPEs) in this work. It utilised dispersive liquid-liquid microextraction in combination with ultrahigh performance liquid chromatography/tandem mass spectrometry. The type and volume of extraction solvents, dispersion agent, and amount of NaCl were optimized. The target analytes were detected in the range of 1.0-200 µ g/L with correlation coefficients ranging from 0.9982 to 0.9998, and the detection limits of the analytes were ranged from 0.02 to 0.07 µg/L (S/N = 3). The feasibility of this method was demonstrated by identifying OPEs in aqueous samples that exhibited spiked recoveries, which ranged between 48.7% and 58.3% for triethyl phosphate (TEP) as well as between 85.9% and 113% for the other OPEs. The precision was ranged from 3.2% to 9.3% (n = 6), and the interprecision was ranged from 2.6% to 12.3% (n = 5). Only 2 of the 12 selected samples were tested to be positive for OPEs, and the total concentrations of OPEs in them were 1.1 and 1.6 µg/L, respectively. This method was confirmed to be simple, fast, and accurate for identifying OPEs in aqueous samples.
authors.affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.
authors.forename: Haiying
authors.initials: H
authors.lastname: Luo
authors.affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Xian
authors.affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.
authors.forename: Xindong
authors.initials: X
authors.lastname: Guo
authors.affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.
authors.forename: Donghui
authors.initials: D
authors.lastname: Luo
authors.affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.
authors.forename: Yuluan
authors.identifier: 0000-0002-8481-8349
authors.initials: Y
authors.lastname: Wu
authors.affiliation: School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510110, China.
authors.forename: Yujing
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
authors.forename: Bao
authors.initials: B
authors.lastname: Yang
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004952:Esters; D005240:Feasibility Studies; D057230:Limit of Detection; D059627:Liquid Phase Microextraction; D009943:Organophosphorus Compounds / Q000032:analysis* / Q000737:chemistry; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004952:Esters; D009943:Organophosphorus Compounds; D014874:Water Pollutants, Chemical