Catalytic kinetic spectrophotometric determination of copper in wastewater treatment plant sludge by copper(Ⅱ)-potassium bromate-natural anthocyanin system
YAN Jin
School of Chemical and Biological Engineering,Nantong Vocational College,Nantong 226007,China
Abstract：Natural anthocyanin was extracted from purple sweet potato as indicator for the determination of copper. Copper(Ⅱ) can sensitively catalyze the discoloration reaction of natural anthocyanin and potassium bromate in HCl medium. A new kinetic spectrophotometric method for the determination of copper(Ⅱ) is thus proposed. The optimum catalytic conditions and kinetic parameters of the reaction were investigated. At the optimal wavelength of 530 nm, the mass concentration of copper(Ⅱ) and the absorbance difference between catalytic and non-catalytic reaction obeyed Beer’s law within the range of 0.01-0.30 μg/mL, with the detection limit of 3.09×10-9 g/mL. The catalytic reaction was zero-order reaction. The apparent activation energy was 41.99 kJ/mol. The apparent rate constant was 5.42×10-4 s-1. The interferences of twenty foreign ions were also tested. The proposed method has been used to determine copper(Ⅱ) in wastewater treatment plant sludge. The relative standard deviations (RSD,n=8) were between 2.0% and 2.5%. Results obtained by proposed method were consistent with the results found by atomic absorption spectrometry.
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