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Determination and speciation of Se(IV), Se(VI), and selenomethionine in iranian walnut samples by spectrophotometry after cloud point extraction

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Abstract

A sensitive and selective micelle-mediated speciation and preconcentration method has been developed for trace amount of inorganic and organic selenium prior to UV-Vis spectrophotometry determination. The method is based on cloud point extraction of Se(IV) ions with polyethylene glycol tert-octylphenyl ether (Triton X-114) in presence of 2,3-diaminonaphthalene (DAN) as a chelating agent. Se(IV) ions react with DAN in a surfactant solution yielding a hydrophobic complex at pH 3. The phase separation was accelerated by a 20 min centrifugation at 3500 rpm. The calibration graph obtained from Se(IV)-DAN complexes was linear in the concentration range of 5.0–400.0 ng/mL and detection limit was 9 ng/mL. The relative standard deviation was 1.6% in the determination of 80 ng/mL Se(IV). The proposed method was successfully applied to the speciation and determination of selenium species-Se(IV), Se(VI), selenomethionine—in walnut samples with satisfactory results.

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Authors and Affiliations

  1. Department of Chemistry, North Tehran Branch, Islamic Azad University, Faculty of Chemistry 9, Daftari Alley, Shariati Str., Tehran, Iran, 1913674711

    Fariba Tadayon & Samane Mehrandoost

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  1. Fariba Tadayon
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  2. Samane Mehrandoost
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Correspondence to Fariba Tadayon.

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Tadayon, F., Mehrandoost, S. Determination and speciation of Se(IV), Se(VI), and selenomethionine in iranian walnut samples by spectrophotometry after cloud point extraction. J Anal Chem 70, 1336–1341 (2015). https://doi.org/10.1134/S1061934815110052

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  • DOI: https://doi.org/10.1134/S1061934815110052

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