Catalytic spectrophotometric determination of trace nickel in aluminum alloy based on the discoloring reaction of methylene blue by oxidation of hydrogen peroxide
HU Xiao-ming, PENG Qin-long
College of Chemistry and Chemical Engineering,Pingdingshan University,Pingdingshan 467000,China
Abstract：In Na3C6H5O7-NaOH buffer solution at pH 5.6, trace nickel had catalytic effect on the fading reaction of methylene blue (MB) oxidized by hydrogen peroxide and the fading degree was linear to the content of nickel. On the basis of these, a new method for catalytic-kinetic spectrophotometric determination of trace nickel was established. The influence factors on the catalytic fading reaction were studied and some kinetic parameters were determined. The results showed that the non-catalytic reaction system and the catalytic reaction system had the same maximum absorption wavelength at 664 nm, and the linear range was 0.02-1.4 μg/mL. The regression equation was lg(A0/At)=0.776 5ρ(μg/mL)+0.157 1 with correlation coefficient r=0.998 6 and detection limit of 0.011 8 μg/mL. The apparent activation energy was 25.14 kJ/mol. The method had been applied to determine trace nickel in aluminum alloy samples, and the results were basically consistent with the certified values. The relative standard deviation (RSD, n=5) was 2.9% and 2.8%, and the recoveries was 98%-104%.
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