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Extraction–thermal lens quantification of cobalt with Nitroso-R-Salt in two-phase aqueous systems with water-soluble polymer polyethylene glycol

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Abstract

A novel method is proposed for the extraction-thermal lens quantification of cobalt with Nitroso-R-Salt based on the distribution of the colored complex in a two-phase aqueous system on the basis of poly-ethylene glycol (PEG) and an ammonium sulfate solution followed by its thermal lens detection in the extract. The limit of detection is 0.3 μM (20 ng/mL); the lower limit of the analytical range is 0.7 μM (40 ng/mL); the relative standard deviation for the concentrations 1–50 μM makes 1–3% (n = 6, P = 0.95). In the determination of cobalt by spectrophotometry under the same conditions, the detection limit is 10 μM (0.6 μg/mL) and the lower limit of the analytical range is 40 μM (2.5 μg/mL). The precision of thermal lens measurements in PEG solutions is higher in comparison to that in aqueous ones because of the weaker interference of convection in aqueous solutions of PEG.

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Authors and Affiliations

  1. Department of Chemistry, Moscow State University, Moscow, 119991, Russia

    D. S. Tsar’kov, E. S. Ryndina & M. A. Proskurnin

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    V. M. Shkinev

Authors
  1. D. S. Tsar’kov
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  2. E. S. Ryndina
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  3. M. A. Proskurnin
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  4. V. M. Shkinev
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Original Russian Text © D.S. Tsar’kov, E.S. Ryndina, M.A. Proskurnin, V.M. Shkinev, 2011, published in Zhurnal Analiticheskoi Khimii, 2011, Vol. 66, No. 2, pp. 170–174.

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Tsar’kov, D.S., Ryndina, E.S., Proskurnin, M.A. et al. Extraction–thermal lens quantification of cobalt with Nitroso-R-Salt in two-phase aqueous systems with water-soluble polymer polyethylene glycol. J Anal Chem 66, 166–170 (2011). https://doi.org/10.1134/S106193481102016X

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