How to analyze the concentrations of Cu2+ and Ni2+ in a mixed solution of copper nitrate and nickel nitrate?
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How can the concentrations of Cu2+ and Ni2+ in a mixed solution of copper nitrate and nickel nitrate be analyzed? What method is good? Spectrophotometry or chemical titration? The concentrations of the two ions are roughly 0.3–0.8 M. I tried some methods, but none of them worked very well. :handshake Last edited by Canghai Yili Sha on 2009-2-12 13:57 ]
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Two samples of the solution are taken: one is titrated for the total amount of copper and nickel using PAN as an indicator, while the other has the copper masked with sodium thiosulfate before titration for nickel. The difference gives the amount of copper. Nickel can also be separated from the dithionite contamination first, with nickel determined by gravimetry, while copper in the filtrate is determined by the EDTA method.
It can be diluted and measured using atomic absorption to accurately determine the concentrations of the two ions.
Generally speaking, the analysis of constants is rarely carried out using atomic absorption spectroscopy; due to the limitations of the instrument’s detection threshold, when the dilution factor is too high, the analytical errors caused by instrumental noise become unacceptable. The solution is to minimize interference from other elements by measuring each element separately – the approach used on the second floor is worth considering