Abstract

A new, simple, sensitive and rapid spectrophotometric method is proposed for the determination of trace amount of nickle(II). The method is based on the formation of a 2:1 complex with 3-(4`- antipyriyl azo) 1- nitroso-2-naphthol (APANN) as a new reagent is developed. The complex has a maximum absorption at 469 nm and ε _max of 0.6x10⁵ L. mol^-1 cm^-1. A linear correlation (0.1 ? 1.8 μg. mL-1) was found between absorbance at λ _max and concentration. The accuracy and reproducibility of the determination method for various known amounts of nickle (II) were tested. The results obtained are both precise (RSD was better than 0.11%) and accurate (relative error was better than 0.97%). The effect of diverse ions on the determination of nickle(II) to investigate the selectivity of the method were also studied. The stability constant of the product was 0.1x10⁷ L. mol^-1. The proposed method was successfully applied to the analysis of synthetic mixtures and raw milk without any preliminary concentration or separation, The apparent thermodynamic parameters were estimated and the obtained results concluded that. The thermodynamic Parameters like ΔG^?, ΔH^? and ΔS^? have been calculated from the effect of temperature on reaction process,its found from these process is Endothermic and spontaneous

Keywords

Nickle(II) determination, Spectrophotometry, Antipyriyl-azo-1-nitroso-2-naphthol, Thermodynamics a