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Optimization of some experimental parameters in the electro membrane extraction of chlorophenols from seawater

Lee, J ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.chroma.2009.09.037
  3. Publisher: 2009
  4. Abstract:
  5. An electro membrane extraction (EME) methodology was utilized to study the isolation of some environmentally important pollutants, such as chlorophenols, from aquatic media based upon the electrokinetic migration process. The analytes were transported by application of an electrical potential difference over a supported liquid membrane (SLM). A driving force of 10 V was applied to extract the analytes through 1-octanol, used as the SLM, into a strongly alkaline solution. The alkaline acceptor solution was subsequently analyzed by high performance liquid chromatography-ultraviolet (HPLC-UV) detection. The parameters influencing electromigration, including volumes and pH of the donor and acceptor phases, the organic solvent used as the SLM, and the applied voltage and its duration, were investigated to find the most suitable extraction conditions. Since the developed method showed a rather high degree of selectivity towards pentachlorophenol (PCP), validation of the method was performed using this compound. An enrichment factor of 23 along with acceptable sample clean-up was obtained for PCP. The calibration curve showed linearity in the range of 0.5-1000 ng/mL with a coefficient of estimation corresponding to 0.999. Limits of detection and quantification, based on signal-to-noise ratios of 3 and 10, were 0.1 and 0.4 ng/mL, respectively. The relative standard deviation of the analysis at a PCP concentration of 0.5 ng/mL was found to be 6.8% (n = 6). The method was also applied to the extraction of this contaminant from seawater and an acceptable relative recovery of 74% was achieved at a concentration level of 1.0 ng/mL. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. High performance liquid chromatography-ultraviolet detection ; 1-octanol ; A-coefficient ; Alkaline solutions ; Analytes ; Applied voltages ; Aquatic media ; Calibration curves ; Concentration levels ; Concentration of ; Donor and acceptor ; Driving forces ; Electrical potential ; Electro membrane extraction ; Electro-membranes ; Electrokinetic ; Enrichment factors ; Environmental water analysis ; Experimental parameters ; Extraction conditions ; HPLC-UV ; Limits of detection ; Migration process ; Relative standard deviations ; Sample clean-up ; Supported liquid membrane ; Chromatographic analysis ; Chromatography ; High pressure liquid chromatography ; Liquid membrane electrodes ; Liquids ; Organic solvents ; Phenols ; Signal to noise ratio ; Ultraviolet detectors ; Water analysis ; Liquid membranes ; Chlorophenol ; Octanol ; Pentachlorophenol ; Sea water ; Calibration ; Controlled study ; Electric potential ; High performance liquid chromatography ; Liquid membrane ; pH ; Priority journal ; Process optimization ; Product recovery ; Quantitative analysis ; Sea pollution ; Signal noise ratio ; Solvent extraction ; Validation process ; Chlorophenols ; Electrochemical Techniques ; Membranes, Artificial ; Seawater ; Solid Phase Extraction ; Water Pollutants, Chemical
  8. Source: Journal of Chromatography A ; Volume 1216, Issue 45 , 2009 , Pages 7687-7693 ; 00219673 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0021967309013934