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

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• 作者：Fariba Tadayon ; Samane Mehrandoost
• 关键词：selenium ; walnut ; cloud point extraction ; 2 ; 3 ; diaminonaphtalene ; green chemistry
• 刊名：Journal of Analytical Chemistry
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：70
• 期：11
• 页码：1336-1341
• 全文大小：230 KB
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• 作者单位：Fariba Tadayon (1)
  Samane Mehrandoost (1)
  
  1. Department of Chemistry, North Tehran Branch, Islamic Azad University, Faculty of Chemistry 9, Daftari Alley, Shariati Str., Tehran, Iran, 1913674711
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3199

文摘

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 5.0-00.0 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. Keywords selenium walnut cloud point extraction 2,3-diaminonaphtalene green chemistry