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2-Nitroso-1-naphthol as a selective reagent for preconcentration of cobalt by vortex assisted combined with solidification of organic droplet and its determination by flame atomic absorption spectrometry

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Abstract

Highly rapid and selective vortex-assisted liquid–liquid microextraction based on solidification of organic drop has been used for determination of cobalt ion. 2-Nitroso-1-naphthol (2N1N) was used as a selective complexing agent to form stable cobalt–2N1N complex which can be extracted with 1-undecanol at a short time by the assistance of vortex agitator system followed by its determination using flame atomic absorption spectrometry. In vortex assisted, vigorous vortex stream as well as the vibrant effect of vortex system cause very fine droplets of extraction solvent to be produced and extraction occurred at a short time. Some parameters influencing the extraction process such as pH of samples, concentration of 2-nitroso-1-naphthol, extraction solvent volume, extraction time, ionic strength and surfactant addition, as well as interferences were evaluated in detail and optimum conditions were selected. At the optimum conditions, the calibration curve was linear in the range of 15 to 400 μg L−1 of cobalt ions. The relative standard deviation based on ten replicate analysis of sample solution containing 50 μg L−1 of cobalt was 3.4 %. The detection limit (calculated as the concentration equivalent to three times of the standard deviation of the blank divided by the slope of the calibration curve after preconcentration) was 5.4 μg L−1. The accuracy of the proposed method was successfully evaluated by the analysis of certified reference materials. This selective and highly rapid method was used for determination of cobalt ions in different water samples.

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Acknowledgments

The authors wish to thank the Ferdowsi University of Mashhad for the financial support of this project.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran

    Mahmoud Chamsaz, Mohammad Eftekhari, Ali Eftekhari & Ali Yekkebashi

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  1. Mahmoud Chamsaz
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  2. Mohammad Eftekhari
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  3. Ali Eftekhari
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  4. Ali Yekkebashi
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Correspondence to Mohammad Eftekhari.

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Chamsaz, M., Eftekhari, M., Eftekhari, A. et al. 2-Nitroso-1-naphthol as a selective reagent for preconcentration of cobalt by vortex assisted combined with solidification of organic droplet and its determination by flame atomic absorption spectrometry. Environ Monit Assess 185, 9067–9075 (2013). https://doi.org/10.1007/s10661-013-3236-x

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  • DOI: https://doi.org/10.1007/s10661-013-3236-x

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