Cloud point extraction for the determination of copper in environmental samples by flame atomic absorption spectrometry

Shokrollahi A., Ghaedi M., Gharaghani S., Fathi M. R. , SOYLAK M.

QUIMICA NOVA, vol.31, no.1, pp.70-74, 2008 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 31 Issue: 1
  • Publication Date: 2008
  • Doi Number: 10.1590/s0100-40422008000100015
  • Title of Journal : QUIMICA NOVA
  • Page Numbers: pp.70-74


A simple cloud point extraction procedure is presented for the preconcentration of copper in various samples. After complexation by 4-hydroxy-2-mercapto-6-propylpyrimidine (PTU), copper ions are quantitatively extracted into the phase rich in Triton X-114 after centrifugation. Methanol acidified with 0.5 mol L-1 HNO3 was added to the surfactant-rich phase prior to its analysis by flame atomic absorption spectrometry (FAAS). Analytical parameters including concentrations for PTU, Triton X-114 and HNO3, bath temperature, centrifugation rate and time were optimized. The influences of the matrix ions on the recoveries of copper ions were investigated. The detection limits (3SD(b)/m, n=4) of 1.6 ng mL(-1) along with enrichment factors of 30 for Cu were achieved. The proposed procedure was applied to the analysis of environmental samples.