Original scientific paper

https://doi.org/10.5562/cca1803

Cloud Point Extraction of Trace Amounts of Copper and Its Determination by Flow Injection Flame Atomic Absorption Spectrometry

Neda Baghban ; Department of Chemistry, Faculty of Science, Yazd University, Yazd, 89195-741, Iran
Ali Mohammad Haji Shabani ; Department of Chemistry, Faculty of Science, Yazd University, Yazd, 89195-741, Iran
Shayessteh Dadfarnia ; Department of Chemistry, Faculty of Science, Yazd University, Yazd, 89195-741, Iran
Abbas Ali Jafari ; Department of Chemistry, Faculty of Science, Yazd University, Yazd, 89195-741, Iran

Abstract

A simple and convenient method based on cloud point extraction was proposed for the deter- mination of copper. The extraction was carried out in the presence of 2-[(2-mercaptophenylimino)-methyl]phenol (MPMP) as the chelating ligand and octylphenoxypolyethoxyethanol (Triton X-114) as the non-ionic surfactant. After phase separation, the surfactant rich phase containing the complex was diluted with 1.0 mol L–1 solution of HNO3 in methanol and the analyte concentration was determined by flow injection flame atomic absorption spectrometry. Under the optimum conditions, an enhancement factor of 81 was obtained for the preconcentration of copper with 25 mL sample solution. The calibration graph was linear in the range of 1–150 µg L–1, the relative standard deviation (RSD) for ten replicate determinations at 80 µg L–1 Cu level was 1.8 %, and the limit of detection (3 s) and quantification (10 s) were 0.15 and 0.50 μg L–1 respectively. The accuracy of method was confirmed by analysis of certified reference materials and recovery experiments. The proposed method was successfully applied to the determination of copper in rice flour and water samples. (doi: 10.5562/cca1803)

Keywords

copper; flow injection flame atomic absorption spectrometry; cloud point extraction; Triton X-114; 2-[(2-mercaptophenylimino)methyl]phenol

Hrčak ID:

80451

URI

https://hrcak.srce.hr/80451

Publication date:

30.4.2012.

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