Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chroma.2005.05.077
Title: Automated dynamic liquid-liquid-liquid microextraction followed by high-performance liquid chromatography-ultraviolet detection for the determination of phenoxy acid herbicides in environmental waters
Authors: Wu, J.
Kim, H.E.
Hian, K.L. 
Keywords: Automation
Dynamic extraction
Hollow fiber membranes
Liquid-liquid-liquid microextraction
Liquid-phase microextraction
Phenoxy acid herbicides
Water analysis
Issue Date: 5-Aug-2005
Citation: Wu, J., Kim, H.E., Hian, K.L. (2005-08-05). Automated dynamic liquid-liquid-liquid microextraction followed by high-performance liquid chromatography-ultraviolet detection for the determination of phenoxy acid herbicides in environmental waters. Journal of Chromatography A 1082 (2) : 121-127. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chroma.2005.05.077
Abstract: Automated dynamic liquid-liquid-liquid microextraction (D-LLLME) controlled by a programmable syringe pump and combined with HPLC-UV was investigated for the extraction and determination of 5 phenoxy acid herbicides in aqueous samples. In the extraction procedure, the acceptor phase was repeatedly withdrawn into and discharged from the hollow fiber by the syringe pump. The repetitive movement of acceptor phase into and out of the hollow fiber channel facilitated the transfer of analytes into donor phase, from the organic phase held in the pore of the fiber. Parameters such as the organic solvent, concentrations of the donor and acceptor phases, plunger movement pattern, speed of agitation and ionic strength of donor phase were evaluated. Good linearity of analytes was achieved in the range of 0.5-500 ng/ml with coefficients of determination, r2 > 0.9994. Good repeatabilities of extraction performance were obtained with relative standard deviations lower than 7.5%. The method provided up-to 490-fold enrichment within 13 min. In addition, the limits of detection (LODs) ranged from 0.1 to 0.4 ng/mL (S/N = 3). D-LLLME was successfully applied for the analysis of phenoxy acid herbicides from real environmental water samples. © 2005 Elsevier B.V. All rights reserved.
Source Title: Journal of Chromatography A
URI: http://scholarbank.nus.edu.sg/handle/10635/93159
ISSN: 00219673
DOI: 10.1016/j.chroma.2005.05.077
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