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Preconcentration and determination of chromium in water with flame atomic absorption spectrometry by thiourea-formaldehyde as chelating resin

  • Separation Technology, Thermodynamics
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Abstract

Thiourea-formaldehyde chelating resin is synthesized simply and rapidly from thiourea and formaldehyde by condensation polymerization and characterized by IR spectra and studied for the preconcentration and determination of trace Cr(III) ion from solution samples. The optimum pH value for sorption of the metal ion was 6.5. The sorption capacity of resin for Cr(III) was determined. The chelating resin can be reused for 20 cycles of sorption-desorption without any significant change in sorption capacity. A recovery of 96% was obtained for the metal ion with 0.5M HNO3 as eluting agent. The equilibrium adsorption data of Cr(III) on modified resin were analyzed by Langmuir, Freundlich and Temkin models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined as 0.016, 0.040 and 0.074 at pH 6.5 and 20°C. The method was applied for chromium ion determination from river water sample.

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Authors and Affiliations

  1. Department of Chemistry, Islamic Azad University, Central Tehran Branch, Tehran, Iran

    Homayon Ahmad Panahi

  2. Department of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, Iran

    Amir Abdollah Mehrdad Sharif

  3. Department of Sea Chemistry, Faculty of Marin of Sciences and Technology, Islamic Azad University, North Tehran Branch, Tehran, Iran

    Mehrnaz Bigonah

  4. Department of Chemistry, Islamic Azad University, Varamin (Pishva) Branch, Tehran, Iran

    Elham Moniri

Authors
  1. Homayon Ahmad Panahi
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  2. Amir Abdollah Mehrdad Sharif
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  3. Mehrnaz Bigonah
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  4. Elham Moniri
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Correspondence to Homayon Ahmad Panahi.

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Panahi, H.A., Sharif, A.A.M., Bigonah, M. et al. Preconcentration and determination of chromium in water with flame atomic absorption spectrometry by thiourea-formaldehyde as chelating resin. Korean J. Chem. Eng. 26, 1723–1728 (2009). https://doi.org/10.1007/s11814-009-0275-7

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  • DOI: https://doi.org/10.1007/s11814-009-0275-7

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