140. Solving a chemistry problem

1. When determining the content of elements in steel (manganese, chromium, nickel, vanadium - in accordance with the task number), the optical density was measured using the calibration graph method on an SF-4 spectrophotometer at a wavelength λ
standard solutions and test sample (λMn = 293.3 nm
λCr = 279.2 nm, λNi = 341.5 nm, λV = 311.1 nm). Determine the percentage of the element in steel (table 1).