Study on catalytic kinetic spectrophotometric determination of trace copper with CuII-H_2O_2-methyl blue system

A new catalytic spectrophotometric method for the determination of trace CuⅡwas established.The method was based on catalytic effect of Cu?on the oxidation of methyl blue by hydrogen peroxide in the medium of 0.1 mol/L H_2SO_4.The optimum conditions of the decoloring reaction were studied.The maximum absorption wavelength of this system is located at 560 nm.The linear range for the determination of copper is 0-0.08 mg/L,and the detection limit is 1.37×10~(-7) g/L.The method has been applied to the determination of trace copper in the tap water samples with satisfactory results.