Preconcentration and Separation Capabilities of the Modified Bentonite Using Dithizone for Trace Cobalt in Water

Abstract:

In this paper, a new method for the preconcentration and separation of cobalt was described. The methodology combines determined using an atomic absorption spectrometry (FAAS) with adsorption and desorption of cobalt on the modified bentonite using dithizone (Bent-dithizone). The operation conditions for the pre-concentration and separation of the cobalt, including pH, contact time, eluent condition and co-existing ions have been investigated. The result showed that the cobalt ion could be adsorbed by Bent-dithizone. The adsorption quantity was affected by the pH value of medium and shaking time. In the medium of pH 6.0, the adsorption capacity of Bent-dithizone to cobalt ion was 18.12 mg·g^-1 when the shaking time was 15 min. The cobalt adsorbed on the adsorbent could be completely eluated and recovered using 10 g·L¹ EDTA solution. The enrichment factor was more than 100. The detection limit of cobalt was 0.46 ng·L¹.The purposed method has been applied to the pre-concentration and separation of cobalt in the water sample, the recovery 97.94%-101.6%.

• Periodical: Advanced Materials Research (Volume 826)
• Pages: 203-206
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.826.203
• Online since: November 2013
• Authors: En Jun Song*
• Keywords: Cobalt, Concentration, Dithizone, Organobentonite, Separation

References

[1] B.J. Alloway, D.C. Ayres, Chemical Principles of Environmental Pollution, Chapman & Hall, Oxford, (1993).

[2] D. Lison, M. De Boeck, Occup. Environ. Med. Vol. 58 (2001), p.619.

[3] Vucetic, Krstic, Mineralne supstance u ishrani i njigov bioloski znacaj, Beograd, in Serbian, (2000).

[4] Jeredic, Vucetic. Mikroelementi u bioloskom materijalu, Privredni pregled, Beograd, in Serbian, (1982).

[5] State Environmental Protection Administration of China. Analysis Method of Water and Waste Water, fourth ed., China Environmental Science Press, Inc. Beijing, (2002).

[6] S.G. Sarkar, P.M. Dhadke, Sep. Purif. Technol. Vol. 15 (1999), p.131.

[7] N. Tokman, S. Akman, M. Ozcan, Talanta, Vol. 59 (2003), p.201.

[8] D. Zhang, G.J. Ren, L. Z. Xu, J. Chem. Ind. Eng., Vol. 59(2008), p.1535. (in Chinese).

[9] D. Zhang, J. Zhang, L. Z. Xu, G.J. Ren, Metal. Anal., Vol. 28 (2008), p.57. (in Chinese).