Preconcentration of copper using 1,5-diphenyl carbazide as the complexing agent via dispersive liquid-liquid microextraction and determination by flame atomic absorption spectrometry

We report a simple and sensitive microextraction system for the preconcentration and determination of cu (ii) by flame atomic absorption spectrometry (faas). dispersive liquid-liquid microextraction is a modified solvent extraction method and its acceptor-to-donor phase ratio is greatly reduced compared with other methods. in the proposed approach,1,5-diphenyl carbazide (dpc) was used as a copper ion selective complexing agent. several variables such as the extraction and dispersive solvent type and volume,ph of sample solution,dpc concentration,extraction time,and ionic strength were studied and optimized for a quantitative preconcentration and determination of copper (ii) and at the optimized conditions: 60 μl,0.5 ml,and 5 ml of extraction solvent (chloroform),disperser solvent (ethanol),and sample volume,respectively,a linear calibration graph was obtained over the concentration range of 10-200 μg l -1 for cu (ii) with r 2 = 0.9966. the limit of detection (3s b /m),and preconcentration factor are 2 μg l -1 and 25,respectively. the relative standard deviation (n = 10) at 100 μg l -1 of cu (ii) is 2.5. the applicability of the developed technique was evaluated by application to spiked environmental water samples. © 2013 reyhaneh rahnama et al.