nano-sio2 modified by ctab and oxime ligand for separation and preconcentration of trace amount of cu(ii) in real environmental samples

A simple, novel, accurate and selective method for the determination of trace amounts of cu2+ ions in water and soil samples is proposed. the method is based on the separation and preconcentration of cu2+ on a nanosio2 modified by a cetyltrimethylammonium bromide as surfactant and indane1,2,3trione1,2dioxime as complexing agent. the retained copper on the nanosorbent was eluted with 1.5 ml of 1.0 mol l1 hno3 and measured by flame atomic absorption spectrometry. the synthesis of this nanosorbent is also described and certified by ftir, xrd and tem techniques. furthermore, several effective analytical parameters were evaluated and optimized. under the best optimum conditions maximum absorption capacity, enrichment factor and limit of detection were 7.04 mg g1, 333.3 and 4.4 µg l1, respectively. the relative standard deviation of the preconcentration method was 0.28% (n=7) and calibration curve gave good level of linearity with correlation coefficient value 0.997. finally, the feasibility and performance of the method was evaluated by determination of copper (ii) ions in several water and soil samples with satisfied results.