Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chroma.2013.01.030
Title: Vortex-assisted micro-solid-phase extraction followed by low-density solvent based dispersive liquid-liquid microextraction for the fast and efficient determination of phthalate esters in river water samples
Authors: Guo, L.
Lee, H.K. 
Keywords: Dispersive liquid-liquid microextraction
Low-density solvent
Phthalate esters
Vortex-assisted micro-solid-phase extraction
Issue Date: 26-Jul-2013
Citation: Guo, L., Lee, H.K. (2013-07-26). Vortex-assisted micro-solid-phase extraction followed by low-density solvent based dispersive liquid-liquid microextraction for the fast and efficient determination of phthalate esters in river water samples. Journal of Chromatography A 1300 : 24-30. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chroma.2013.01.030
Abstract: A simple and efficient two-step method, vortex-assisted micro-solid-phase extraction (VA-μ-SPE) followed by low-density solvent based dispersive liquid-liquid microextraction (LDS-DLLME) combined with analysis by gas chromatography-mass spectrometry (GC-MS), was developed for the determination of trace level phthalate esters in environmental water samples. The analytes were firstly extracted and preconcentrated by vortex-assisted μ-SPE which was faster than conventional μ-SPE (6. min compared to 30. min), and then desorbed by ultrasonication into acetonitrile. The latter served as the dispersive solvent in the subsequent LDS-DLLME step which further pre-concentrated the analytes. Six phthalate esters were selected as model compounds for developing and evaluating the method. Some key parameters for VA-μ-SPE and LDS-DLLME, such as sorbent selection and amount, vortex time, ultrasonication solvent and time, extraction solvent type and volume for DLLME, the speed and time of centrifugation, were investigated. Under the most favorable conditions, good limits of detection (as low as 0.006. μg/L) and repeatability of extraction (RSDs below 9.2%, n = 5) were obtained. The developed method was applied to determine phthalate esters in environmental water samples. © 2013 Elsevier B.V.
Source Title: Journal of Chromatography A
URI: http://scholarbank.nus.edu.sg/handle/10635/77359
ISSN: 00219673
DOI: 10.1016/j.chroma.2013.01.030
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