Preconcentration and Separation Capabilities of Nano-Barium-Strontium Titanate Powder Coated by Dithizone for Trace Cobalt in Water

Abstract:

A new method for the preconcentration and separation of cobalt ion in water was described. The methodology combines determination using a flame atomic absorption spectrometry (FAAS) with adsorption and desorption of cobalt on the nano-barium-strontium titanate powder coated by dithizone (BST-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 BST-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 BST-dithizone to cobalt ion was 8.92 mg·g^-1 when the shaking time was more than10 min. The cobalt adsorbed on the adsorbent could be completely eluated and recovered using 10 g·L⁻¹ ethylene diamine tetraacetic acid (EDTA) solution. The enrichment factor was 100. The detection limit of cobalt was 0.53 ng·L⁻¹. The purposed method has been applied to the pre-concentration and separation of cobalt in the water sample with satisfied results.

• Periodical: Advanced Materials Research (Volume 279)
• Pages: 166-169
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.279.166
• Online since: July 2011
• Authors: Dong Zhang
• Keywords: Cobalt, Dithizone, Nano-Barium-Strontium Titanate, Preconcentration, Separation

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