Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/77458
Title: Low-density solvent in solvent demulsification dispersive liquid-liquid microextraction for the determination of phenols in environmental water samples
Authors: Guo, L.
Lee, H.K. 
Issue Date: 2011
Citation: Guo, L.,Lee, H.K. (2011). Low-density solvent in solvent demulsification dispersive liquid-liquid microextraction for the determination of phenols in environmental water samples. ACS National Meeting Book of Abstracts : -. ScholarBank@NUS Repository.
Abstract: A novel low-density solvent-based solvent demulsification dispersive liquid-liquid microextraction (DLLME) approach was developed for the fast and efficient extraction and determination of phenols in environmental water samples followed by analysis with high-performance liquid chromatography (HPLC/UV). In the extraction procedure, a 4-mL water sample was placed in a 5-mL soft polyethylene Pasteur pipette. A mixture of 50 μL of 1-octanol (serving as extraction solvent) and 450 μL acetone (dispersive solvent) was injected rapidly into the sample solution through a 1.0 mL syringe to form an emulsion. At the emulsification stage, extraction could be achieved very fast. And then, a second 500 μL of acetone (serving as demulsification solvent) was injected into the solution to break the emulsion and subsequently, the emulsion was separated into two phases rapidly. The pipette bulb was then squeezed slightly. The upper layer (organic extract) moved into the much narrower stem of the pipette, facilitating its retrieval using a 50 μL HPLC syringe. Ten microlitres of the extract were collected and injected into the HPLC instrument for analysis. Six phenols including 2-nitrophenol, 4-chlorophenol, 2,3-dichlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol were selected as model compounds for developing and evaluating the method. Several factors affecting the extraction efficiency including the selection and volume of extraction solvent, the selection and volume of dispersive solvent and demulsification solvent, the extraction time, the pH, and the effect of sample solution ionic strength were investigated in detail. Under the optimized extraction conditions, the method showed good linearity in the range of 0.1-50 μg/L and good repeatability of extractions (RSD below 9.2%, n=5). The proposed method was demonstrated to be a fast and efficient method for the determination of phenols from environmental water samples.
Source Title: ACS National Meeting Book of Abstracts
URI: http://scholarbank.nus.edu.sg/handle/10635/77458
ISSN: 00657727
Appears in Collections:Staff Publications

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