6.1. (3) For the determination of nickel with dimethyldioxime, a sample of steel was dissolved and the solution was diluted to 100.0 ml. The required reagents were added to a 5 ml aliquot of this solution, diluted with water to 50.0 ml, and photometrically measured in a cuvette with a solution layer thickness of 1 cm at λeff = 470 nm (ε = 1.30*104).
Calculate the weight of the sample of steel for analysis if the optimal value of the optical density is 0.435. The approximate mass fraction of nickel in steel w (%) is: option 1 - 0.5%; option 2 - 1.0%; option 3 - 2.5%; option 4 - 3.0%.

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