2. Calcium determinations in natural water were carried out using the AAS method at λ=622 nm. For the analyzed solution, the optical density is 31.0; for the solution obtained by mixing 50 ml of the test and 25.0 ml of the standard (Cst = 50.0 μg/ml) - 80.2, and for the control solution - 3.5. Calculate the calcium content in the analyzed solution.

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