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• W2049342010 abstract "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-2-[5-(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." @default.
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• W2049342010 date "2011-09-01" @default.
• W2049342010 modified "2023-09-27" @default.
• W2049342010 title "A novel, environmentally friendly dispersive liquid–liquid microextraction procedure for the determination of copper" @default.
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• W2049342010 doi "https://doi.org/10.1016/j.microc.2011.03.008" @default.
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