3. Formized complexes of copper and nickel at λ=450 nm have molar absorption coefficients, respectively, єλCu=1.8*103 l/mol*cm and єλNi =1.2*103 l/mol*cm, at λ=620 nm єλCu= 5.6*103 l/mol*cm and єλNi =3.55*103 l/mol*cm. Calculate the concentration of copper and nickel in a solution whose optical density at λ=450 nm is 0.25, and at λ=620 nm - 0.78 (l=1cm).
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