Narges Vaezi - FIA-Lab., Department of Chemistry, Faculty of Sciences, University of Zanjan, Zanjan, Iran
Nasser Dalali - FIA-Lab., Department of Chemistry, Faculty of Sciences, University of Zanjan, Zanjan, Iran
Mehdi Hosseini - FIA-Lab., Department of Chemistry, Faculty of Sciences, University of Zanjan, Zanjan, Iran; University of Applied-Science, Branch of Calcimin, Dandi, Zanjan, Iran

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 nano-SiO2 modified by a cetyltrimethylammonium bromide as surfactant and indane-1,2,3-trione-1,2-dioxime as complexing agent. The retained copper on the nano-sorbent was eluted with 1.5 mL of 1.0 mol L-1 HNO3 and measured by flame atomic absorption spectrometry. The synthesis of this nano-sorbent 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 g-1, 333.3 and 4.4 µg L-1, 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.

Nano-SiO2 Modified, Cetyltrimethylammonium Bromide Surfactant, Indane Ligand, Separation, Preconcentration, Copper Determination