Ali Jouki - Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz
Saadat Rastegarzadeh - Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz
Behrooz Zargar - Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz
Mojgan Zendehdel - Department of Chemistry, Faculty of Science, Arak University, Arak

Nanoporous anodic alumina (NAA) is a self-organized material with nanopore arrays. The porous structure can be altered by varying anodization processing parameters and the resulting porous shapes can be tailored with specific pore diameters [1]. NAA has been used in several fields of nanotechnology [2]. In this work, a nanoporous anodic alumina was prepared and used for the solid phase extraction (SPE) of Cr(VI). The metal ion was adsorbed on modified NAA as its complex with 1,5-diphenylcarbazide, then eluted using a mixture of ethanol/HCl and determined by spectrophotometry. The modified NAA was characterized by FT-IR, FE-SEM, EDX analysis and mapping and AFM. The influence of important parameters on the formation of NAA and SPE method such as surface area of aluminum foil, applied voltage, activator acid, pH, type and concentration of eluent as well as adsorption and desorption time was investigated and optimized. Under optimum conditions, the extracted analyte was quantified by UV–Vis spectrophotometry with a detection limit of 1.1 ng mL-1 for Cr(IV). This new method was successfully applied to determine Cr(VI) in environmental samples.