Abstract：The fading reaction of methylene blue oxidized by hydrogen peroxide could be catalyzed by trace nickel in NH3-NH4Cl buffer solution at pH 8.00 under heating condition at 100 ℃. Accordingly, a method was established for determination of trace nickel by catalytic kinetic spectrophotometry. It was found that the difference of absorbance (ΔA) between non-catalytic reaction (A0) and catalytic reaction (A) at 655 nm had good linearity to the mass concentration of nickel in range of 0.01-0.30 μg/mL. The detection limit of method was 8.6×10-3 μg/mL. The apparent rate constant of this catalytic reaction was 8.2×10-4 s-1, and the apparent activation energy was 66.08 kJ/mol. The proposed method was applied to the determination of trace nickel in waste water samples from Yanhe River and tap water plant. The results were consistent with those obtained by atomic absorption spectrometry. The relative standard deviation (RSD, n=6) was 1.2%-1.6%. The recoveries were between 99% and 102%.
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