Preconcentration and determination of carbaryl and carbofuran in water samples using ionic liquids and in situ solvent formation microextraction

Tehrani, M. S ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1039/c3ay00010a
  3. Publisher: 2013
  4. Abstract:
  5. In the present work, a novel microextraction method named in situ solvent formation microextraction (ISFME) using ionic liquids (ILs) for preconcentration of carbaryl and carbofuran in water samples is introduced. In this method, a small amount of sodium hexafluorophosphate (NaPF6), as an ion pairing agent, was added to a sample solution containing a small quantity of 1-hexyl-3-methylimidazolium tetrafluoroborate [Hmim][BF4] as a hydrophobic ionic liquid. A cloudy solution formed as a result of formation of fine droplets of 1-hexyl-3-methylimidazolium hexafluorophosphate [Hmim][PF 6]. After centrifugation, the fine droplets of the extractant phase settled to the bottom of the conical-bottom glass centrifuge tube. Analysis was carried out using HPLC-UV. To obtain the best extraction results, some experimental parameters affecting the extraction efficiency were optimized. Under optimum conditions, the calibration curve was linear in the concentration range of 0.05-50 ng mL-1 for two pesticides, with the square correlation coefficients (r2) equal to 0.998 for carbaryl and 0.997 for carbofuran. Good enrichment factors of 85 and 100 were achieved for carbaryl and carbofuran, respectively. The limits of detection (LODs) (S/N = 3) were 0.09 ng mL-1 and 0.1 ng mL-1 for carbaryl and carbofuran, respectively. The method was successfully applied to analysis of pesticide residues in water samples
  6. Keywords:
  7. 1-hexyl-3-methylimidazolium hexafluorophosphate ; Correlation coefficient ; Experimental parameters ; Extraction efficiencies ; Glass centrifuge tubes ; Hexafluorophosphates ; Hydrophobic ionic liquid ; Situ solvent formation microextraction ; Drops ; Insecticides ; Solvent extraction ; Ionic liquids
  8. Source: Analytical Methods ; Volume 5, Issue 9 , 2013 , Pages 2406-2412 ; 17599660 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2013/AY/c3ay00010a#!divAbstract