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Determination of cadmium and zinc in water samples by flame atomic absorption spectrometry after cloud-point extraction

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Abstract

The phase-separation phenomenon of nonionic surfactants occurring in an aqueous solution was used for the extraction of Cd and Zn from water samples. After complexation with 6-(4-nitrophenyl)-2,4-diphenyl-3,5-diaza-bicyclo[3.1.0]hex-2-ene (NDDBH) in hydrochloric acid medium (pH 1), the analytes were quantitatively extracted after centrifugation into the phase rich in the nonionic surfactant octylphenoxypolyethoxyethanol (Triton X-114). Tetrahydrofuran acidified with 0.1 M HCl was added to the surfactant-rich phase prior to its analysis by flame atomic absorption spectrometry. The adopted concentrations for NDDBH, Triton X-114 and hydrochloric acid were all optimized. Detection limits (3σ) of 0.33 and 0.85 ng/mL along with enrichment factors of 157 and 118 for Cd and Zn, respectively, were achieved. The proposed method was applied to the determination of Cd and Zn in acidic solutions of certified reference materials. A comparison with certified values was performed for an evaluation of the accuracy, resulting in a good agreement according to the t-test at a 95% confidence level. The high efficiency of the cloud-point extraction to carry out the determination of the studied analytes in complex matrices was, therefore, demonstrated.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Guilan University, P.O. Box 1914, Rasht, Iran

    M. Arvand, A. Pourhabib, A. Afshari, M. Bagherinia & N. Ghodsi

  2. Technical Center of Higher Education, P.O. Box 41635-1986, Rasht, Iran

    R. Shemshadi

Authors
  1. M. Arvand
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  2. A. Pourhabib
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  3. A. Afshari
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  4. M. Bagherinia
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  5. N. Ghodsi
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  6. R. Shemshadi
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Correspondence to M. Arvand.

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The text was submitted by the authors in English.

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Arvand, M., Pourhabib, A., Afshari, A. et al. Determination of cadmium and zinc in water samples by flame atomic absorption spectrometry after cloud-point extraction. J Anal Chem 63, 954–959 (2008). https://doi.org/10.1134/S1061934808100055

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  • DOI: https://doi.org/10.1134/S1061934808100055

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