Simultaneous Determination of Co~(2+) and Ni~(2+) Content in Alloy Electrolyting Solution by Double-wavelength Spectrophotometric Method

The best experimentation condition to make a simultaneous determination of cobalt and nickel in alloy electrolyting solution by the dual-wavelength spectrophotometry with PAR as chromogenic regent was found out.In a solution of NH3·H2O–NH4Cl buffer at pH=8.0,the optimum spectrometric conditions of cobalt and nickel with PAR were studied by orthogonal design,and the result was satisfactory.The determination wavelength and reference wavelength were λmax,Co=512 nm,λCo=482 nm for cobalt and λmax,Ni=496 nm,λNi=526 nm for nickel.At these wavelength,the linear equation and linear range of y=0.0907x-0.0162 and 8.00～22.00 μg/25 mL of cobalt and the linear equation and linear range of y=0.3632x+0.0197and 4.00～14.00 μg/25 mL of nickel.Alloy electrolyting sample were determined by the proposed method.This method has been applied successfully to analyse alloy electrolyting solution.