Abstract
A sensitive and selective kinetic method is proposed for the determination of nanogram amounts of copper. The method is based on the catalytic effect of copper on the reduction of Ponceau S by sodium sulfide in an alkaline media. The rate of the reaction is monitored spectrophotometrically at 560 nm. The method allows determination of copper concentrations in the range 2–400 ng ml −1 with a relative standard deviation of ∼2%. The proposed method, which is highly selective to copper, has been applied satisfactory to its determination in real samples.
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