Enrichment and Determination of Ni2+ions in Water Samples with Adiamino-4-(4-nitro-phenylazo)-1H-pyrazole (PDANP) by Using FAAS

Abstract

Nickel, as a heavy metal, is toxic for many living species. Thus, the determination of trace amounts of nickelin environmental samples is of great importance. In the present study, new, sensitive, simple and validatedsolid phase extraction method is developed for the determination of nickel. In recent study nickel waspreconcentrated as diamino-4-(4-nitro-phenylazo)- 1H-pyrazole (PDANP) chelates (Ni-PDANP) fromsample solutions using a column containing Amberlite XAD-7 and determined byflame atomic absorptionspectrometry (FAAS). The optimum experimental parameters such as pH of the medium, sampleflow rate,eluent and effect of matrix ions on the method efficiency were investigated. The optimum pH value forquantitative sorption of Ni–PDANP was found between 6.0 and 8.0. Elution process was performed by using6 mL of 2 mol L−1HCl. The sorption capacity of resin was determined to be 7.2 mg g−1for Ni. Thepreconcentration factor was 125. In optimized conditions. A relative standard deviation and detection limitwere found to be 2.8% and 0.44μgL−1respectively. The method was successfully applied to determine thetrace amounts of nickel in tap water and mineral waters, and suitable recoveries were obtained (100.0–103.5%).