New solid phase extraction method for determination of trace nickel

Nickel, as a heavy metal, is toxic for many living species. Thus, the determination of trace amounts of nickel in environmental samples is of great importance. In this study, a new, sensitive, simple and validated solid-phase extraction method is developed for the determination of nickel in level. In this research, nickel ions were preconcentrated as N,N-Bis(Piridin-2-il-metilen)Benzen-1,4-Diamin (BPMBAD) chelates (Ni-BPMBAD) from sample solutions using a column containing Amberlite XAD-7 and determined by flame atomic absorption spectrometry (FAAS). The optimum experimental parameters such as pH of the medium, sample flow rate, eluent and effect of matrix ions on the method efficiency were investigated. The optimum pH value for quantitative sorption of Ni-BPMBAD was found between 6.0 and 8.0. Elution process was performed by using 6 mL of 2 mol L-1 HCl. The preconcentration factor was found as 125, in optimized conditions. The relative standard deviation and detection limit were found to be 2.8% and 0.44 ?g L-1, respectively. The method was successfully applied to determine the trace amounts of nickel in tap water and mineral waters, and suitable recoveries were obtained (100.0?103.5%).Keywords: Solid phase extraction, Amberlite XAD?7, BPMBAD, Nickel, Preconcentration, FAAS.