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Sensitive spectrophotometric determination of Co(II) using dispersive liquid-liquid micro-extraction method in soil samples

Environmental Monitoring and Assessment volume 188, Article number: 265 (2016) Cite this article

Abstract

Analytical performance of conventional spectrophotometer was developed by coupling of effective dispersive liquid-liquid micro-extraction method with spectrophotometric determination for ultra-trace determination of cobalt. The method was based on the formation of Co(II)–alpha-benzoin oxime complex and its extraction using a dispersive liquid-liquid micro-extraction technique. During the present work, several important variables such as pH, ligand concentration, amount and type of dispersive, and extracting solvent were optimized. It was found that the crucial factor for the Co(II)–alpha benzoin oxime complex formation is the pH of the alkaline alcoholic medium. Under the optimized condition, the calibration graph was linear in the ranges of 1.0–110 μg L−1 with the detection limit (S/N = 3) of 0.5 μg L−1. The preconcentration operation of 25 mL of sample gave enhancement factor of 75. The proposed method was applied for determination of Co(II) in soil samples.

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Affiliations

  1. Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran

    Foroozan Hasanpour, Masoumeh Taei, Mohsen Nekouei & Elmira Mozafari

  2. Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Hassan Hadadzadeh

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  1. Foroozan Hasanpour
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  2. Hassan Hadadzadeh
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  3. Masoumeh Taei
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  4. Mohsen Nekouei
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  5. Elmira Mozafari
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Correspondence to Foroozan Hasanpour.

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Hasanpour, F., Hadadzadeh, H., Taei, M. et al. Sensitive spectrophotometric determination of Co(II) using dispersive liquid-liquid micro-extraction method in soil samples. Environ Monit Assess 188, 265 (2016). https://doi.org/10.1007/s10661-016-5263-x

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  • DOI: https://doi.org/10.1007/s10661-016-5263-x

Keywords

  • Dispersive liquid-liquid micro-extraction
  • Alpha-benzoin oxime
  • Cobalt(II)
  • Spectrophotometric determination