preconcentration of cu(ii)with magnetic nanocomposite sorbentsprior to determination by flame atomic absorption spectrometer

a simple, highly sensitive, accurate and selective method for determination of trace amounts of cu2+ in water samples .in this paper, chitosan was used to encapsulate nano-fe3o4 and produce a nano-fe3o4-chitosan sorbent based new sorbent was prepared. this was treated with ethylenediamine (ed) in another solvent-free procedure for the formation of a novel nano-fe3o4-chitosan-ed.flame atomic absorption spectrometer was utilized for determination of cu(ii). the analytical features for sorption were found to be 5.2; 4.3 ml min-1 and 55.0 ml for ph, flow rate and sample volume, respectively. hno3 was used as eluent and maximum preconcentration factor was found to be 200.elution parameters were also determined as 4 ml min-1; 0.6 mol l-1 and 5.1 ml forflow rate, eluent concentration and eluent volume, respectively.limit of detection and limit of quantification were found to be 49.6 and 163.7 ng l-1, respectively. validation of the developed method was performed using certified reference material (tmda-53.3). the methodology was applied for determination of cu(ii) in natural water samples and satisfactory results were obtained.