11. The molar light absorption coefficient ε at 410 µm for U(IV) is 2.0, and for U(VI) it is 11.0; at 630 µm ε U(IV) = 330.0, and ε U(VI) = 0. Calculate the concentration of uranium (IV) and uranium (VI) in a concentrated solution of phosphoric acid, if the optical density of this solution at 410 µm is 0, 35, and at 630 µm - 0.78 in a cuvette with a layer thickness of 2 cm.

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