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

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 wit...

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Bibliographic Details
Published in:Química Nova 2008, Vol.31 (1), p.70-74
Main Authors: Shokrollahi, Ardeshir, Ghaedi, Mehrorang, Gharaghani, Shiva, Fathi, Mohammad Reza, Soylak, Mustafa
Format: Article
Language:English
Subjects:
4-hydroxy-2-mercapto-6-propylpyrimidine
CHEMISTRY, MULTIDISCIPLINARY
cloud point extraction
copper ion
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Summary: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 (3SDb/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.
ISSN:0100-4042
1678-7064
1678-7064
DOI:10.1590/S0100-40422008000100015