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Copper. Not more than 5 ppm of Cu determined by atomic absorption spectophotometry.
Problem Dissolution. 5.0 g of the sample are diluted in 0,1N nitric acid and the solution is diluted up to 25.0 ml with the same acid.
Reference Dissolution. Reference Dissolutions containing 0.2 ppm, 0.4 ppm and 0.6 ppm of Cu are prepared by the appropriate dilution of the dissolution of (10 ppm Cu)R in 0.1N nitric acid.

Problem Dissolution-?
Reference Dissolution-?

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