Catalytic kinetic spectrophotometric determination of ruthenium based on oxidation of potassium periodate on the color reaction of light green

A kinetic photometric method for the determination of trace ruthenium based on the catalytic effect of Ru(Ⅲ)on the oxidation of light green by potassium periodate in H3PO4 medium and in a water bath of 40 ℃ is reported.The kinetic parameters and reaction mechanism are studied.In the condition of catalytic system,the maximum absorption wavelength was located at 455 nm.The linear range of the method is 0.005-0.08 μg/10mL and the detection limit is 5.7×10-11g/mL for Ru(Ⅲ).The relative standard deviation(RSD)for 11 replicate determinations of 0.04 μg/10 mL of Ru(Ⅲ)is 0.34%.The apparent activation energy of catalytic reaction is found to be 25.37 kJ/mol and the rate constant is 9.28×10-3 /s.The method has been applied to the determination of Ru(Ⅲ)in ore and anode slime with RSD of 1.6% and 2.1%,the recoveries of 99.9% and 101.2%,respectively.