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

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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).

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Acknowledgement

The authors thank the Research Council of Iran University of Science and Technology (IUST), for the financial support.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran

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

  2. Electroanalytical Chemistry Research Center, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran

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

Authors
  1. Payam Hemmatkhah
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  2. Araz Bidari
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  3. Sanaz Jafarvand
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  4. Mohammad Reza Milani Hosseini
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  5. Yaghoub Assadi
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Correspondence to Yaghoub Assadi.

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Hemmatkhah, P., Bidari, A., Jafarvand, S. et al. Speciation of chromium in water samples using dispersive liquid–liquid microextraction and flame atomic absorption spectrometry. Microchim Acta 166, 69–75 (2009). https://doi.org/10.1007/s00604-009-0167-x

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  • DOI: https://doi.org/10.1007/s00604-009-0167-x

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