Abstract
A method is proposed for the simultaneous determination of copper and nickel by third-derivative spectrophotometry based on the absorption spectra of their complexes with cyanide ion in the ultraviolet range. The method allows the determination of 0.55–5.8 μg/ml of copper and 0.55–6.8 μg/ml of nickel. The relative standard deviation for 11 determinations of 1.5 μl/ml of copper and nickel were 0.78 and 0.72%, respectively. The detection limits were 0.10,μg/ml for nickel and 0.13 μg/ml for copper. The method has been applied to direct determination of copper and nickel in iron alloys and an aluminium alloy without any separation.
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