Abstract :
A novel sensitive chromogenic reagent, N,N’bis(3-methylsalicylidene)-ortho-phenylene diamine (MSOPD), has been synthesized and used in the spectrophotometric determination of nickel. At pH 8, MSOPD can react with nickel ion at room temperature to form a 1:1 complex. The apparent molar absorptivity is 9.5 * 10^4 l mol^-1 cm^-1 at 430 nm. Beer’s low is obeyed over the range 0-1.0 * 10^-5 M of nickel with a detection limit of 1.36 * 10^-8 M. The relative standard deviation for measurement of 3.41 * 10^-6 M nickel is 1.3% (n = 10). The method has successfully been applied to determination of trace amounts of nickel in some natural food samples.
