Resonance Scattering Spectrometric Determination of Trace Amounts of Nickel by Its Reaction with PAN Sensitized with SDBS

Intensity of resonance scattering of the reaction between Ni(Ⅱ) and 1-(2-pyridylazo)-2-naphthol (PAN),in a Tris-HCl buffer medium of pH 8.0,was sensitized by sodium dodecylbenzene Sulfonate (SDBS),and the magnitude of increase in resonance rayleigh scattering intensity (ΔI) was found keeping linear relationship with the concentration of Ni(Ⅱ) ion in the range from 15-500 μg·L-1 when measured at 545 nm (the maximum scattering wavelength of the reaction system).Detection limit (3S/N) of the method was found to be 4.57 μg·L-1.Precision was tested at 3 concentration levels of 50,200,400 μg·L-1 of Ni(Ⅱ) for 11 determinations,values of RSD′s (n=6) found were 3.5%,3.0% and 1.7% respectively.Based on these facts,a simple and rapid method for determination of nickel was proposed.In its application to analysis of water samples for their nickel contents,value of average recovery found was 98.5%.