3. Calculate the content of copper and nickel in the mixture based on their light absorption in the diethyldithiocarbonate complex at 436 and 328 nm. The total volume of the test solution is 500 ml, the volume of the photocolorimetric solution is 20 ml. Molar absorption coefficients (ε) for Cu (436 nm)-12850 and Cu (328 nm)-2230, Ni (436 nm)-1720 and Ni (328 nm)-352101. The optical densities of the test solution A (436) and A (328) are respectively equal to: 0.24 and 0.39.

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