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"Selective determination of copper and iron in various food samples by the solid phase extraction." Food Chemistry 123.1 (2010): 183-187., Mir Ali, Morteza Bahram, and Jan Åke Jönsson. "Dispersive liquid–liquid microextraction followed by high-performance liquid chromatography-diode array detection as an efficient and sensitive technique for determination of antioxidants." Analytica Chimica Acta 591.1 (2007): 69-79. Abstract In this study, the liquid phase microextraction method using vortex has been used as a simple, fast and efficient method for selective extraction of trace amounts of copper(II) ion. The extraction solvent and complexing agent in the suggested approach was N,N-Dimethyl-n-octylamine , which may form a hydrophobic complex with copper(II) ion. The copper(II) ion values were determined using a flame atomic absorption spectroscopy (FAAS). Additionally, in the present study, the vortex was empolyed for the elemination of the dispersive solvent. The effect of different parameters on extraction efficiency such as pH, type and volume of buffer, volume of ligand (as extracting solvent and complexing agent), aqueous phase volume, temperature, vortex time, ionic strength, salt type, centrifuge time, centrifuge speed were investigated and optimized. Under the optimal conditions, the linear range of the calibration curve is 0/005-0/3 mg/L, the detection limit is 0/00093 mg/L, and the pre-concentration factor is 22/6. Relative standard deviation values for repetitive measurements at concentrations of 0/04, 0/08 and 0/240 mg/L were achieved 2/5%, 4/87% and 1/64%, respectively. This method has been successfully used for the measurement of copper(II) ions in water and tea real samples.