3. Determine the percentage of silver in the copper cathode when analyzing the 3-standard method in AESA, if the blackening of the analytical lines in the spectra of the sample and standards turned out to be equal:
СAg, % 0.18 0.23 0.40 x
SAg 0.41 0.45 0.55 0.47
SFe 0.64 0.65 0.65 0.65

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