Microchimica Acta

, Volume 166, Issue 1, pp 69–75

Speciation of chromium in water samples using dispersive liquid–liquid microextraction and flame atomic absorption spectrometry

Authors

  • Payam Hemmatkhah
    • Department of Analytical Chemistry, Faculty of ChemistryIran University of Science and Technology
    • Electroanalytical Chemistry Research CenterIran University of Science and Technology
  • Araz Bidari
    • Department of Analytical Chemistry, Faculty of ChemistryIran University of Science and Technology
    • Electroanalytical Chemistry Research CenterIran University of Science and Technology
  • Sanaz Jafarvand
    • Department of Analytical Chemistry, Faculty of ChemistryIran University of Science and Technology
    • Electroanalytical Chemistry Research CenterIran University of Science and Technology
  • Mohammad Reza Milani Hosseini
    • Department of Analytical Chemistry, Faculty of ChemistryIran University of Science and Technology
    • Electroanalytical Chemistry Research CenterIran University of Science and Technology
    • Department of Analytical Chemistry, Faculty of ChemistryIran University of Science and Technology
    • Electroanalytical Chemistry Research CenterIran University of Science and Technology
Original Paper

DOI: 10.1007/s00604-009-0167-x

Cite this article as:
Hemmatkhah, P., Bidari, A., Jafarvand, S. et al. Microchim Acta (2009) 166: 69. doi:10.1007/s00604-009-0167-x

Abstract

A novel method for preconcentration is described for chromium speciation at microgram per liter to sub-microgram per liter levels. It is based on selective complex formation of both Cr(VI) and Cr(III) followed by dispersive liquid–liquid microextraction and determination by microsample introduction-flame atomic absorption spectrometry. Effects influencing complex formation and extraction (such as pH, temperature, time, solvent, salinity and the amount of chelating agent) have been optimized. Enrichment factors up to 275 and 262 were obtained for Cr(VI) and total Cr, respectively. The calibration graph is linear from 0.3 to 20 µg L−1, and detection limits are 0.07 and 0.08 µg L−1 for Cr(VI) and total Cr, respectively. Relative standard deviations (RSDs) were obtained to be 2.0% for Cr(VI) and 2.6% for total Cr (n = 7).

Keywords

Dispersive liquid–liquid microextractionChromium speciationPreconcentrationFlame atomic absorption spectrometryMicrosample introductionWater analysis

Supplementary material

604_2009_167_MOESM1_ESM.doc (56 kb)
ESM 1(DOC 56 kb)

Copyright information

© Springer-Verlag 2009