期刊
MICROCHEMICAL JOURNAL
卷 99, 期 1, 页码 40-45出版社
ELSEVIER
DOI: 10.1016/j.microc.2011.03.008
关键词
Dispersive liquid-liquid microextraction (DLLME); UV-Vis spectrophotometry; Copper
资金
- Scientific Grant Agency of the Ministry of Education of the Slovak Republic
- Faculty of Science of P. J. Safarik University in Kosice [4/2010/Ch]
- Slovak Academy of Sciences [1/0226/11]
A novel, simple and environmentally friendly procedure for copper determination has been developed. The method is based on the formation of an ion associate of Cu(I) with 1,3,3-trimethyl-245-(1,3,3-trimethyl-1,3-dihydroindol-2-ylidene)-penta-1,3-dienyl]-3H-indolium (DIDC) in the presence of chloride ions as ligand, followed by dispersive liquid-liquid microextraction (DLLME) of the formed ion associate into organic phase and UV-Vis spectrophotometric detection. The following experimental conditions were used: pH 3, 0.24 mol L-1 chloride ions, 0.06 mmol L-1 DIDC. The effect of the nature of the extraction solvent, auxiliary solvent and disperser solvent used was studied. A mixture of amyl acetate, tetrachloromethane, and methanol in a 1:1:3 v/v/v ratio was selected for the DLLME procedure. The absorbance of the coloured extracts at 640 nm wavelength obeys Beer's law in the range 0.020-0.090 mg L-1 of Cu. The limit of detection calculated from a blank test (n = 10) based on 3s is 0.005 mg L-1 of Cu. The developed procedure was applied to the analysis of water samples. The suggested DLLME is compared with two procedures previously reported from our laboratory based on (1) conventional liquid-liquid extraction, and (2) sequential injection extraction performed in a dual-valve sequential injection system. The advantages and disadvantages of each method are discussed. (C) 2011 Elsevier B.V. All rights reserved.
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