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

• Autor(a) principal: Shokrollahi,Ardeshir
• Data de Publicação: 2008
• Outros Autores: Ghaedi,Mehrorang, Gharaghani,Shiva, Fathi,Mohammad Reza, Soylak,Mustafa
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000100015
• topic: 4-hydroxy-2-mercapto-6-propylpyrimidine; cloud point extraction; copper ion

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.