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

  • Payam Hemmatkhah
  • Araz Bidari
  • Sanaz Jafarvand
  • Mohammad Reza Milani Hosseini
  • Yaghoub Assadi
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

Authors and Affiliations

  • Payam Hemmatkhah
    • 1
    • 2
  • Araz Bidari
    • 1
    • 2
  • Sanaz Jafarvand
    • 1
    • 2
  • Mohammad Reza Milani Hosseini
    • 1
    • 2
  • Yaghoub Assadi
    • 1
    • 2
  1. 1.Department of Analytical Chemistry, Faculty of ChemistryIran University of Science and TechnologyTehranIran
  2. 2.Electroanalytical Chemistry Research CenterIran University of Science and TechnologyTehranIran