13. Determine the percentage of vanadium in steel, if the following data are obtained during photometry:
Reference 1 2 3
Сv,% 0.11 0.97 2.79
Sv 0.228 1.015 1.328
SFe 0.608 0.622 0.575

The analyzed sample has SV=1.190 and SFe=0.640. (S is the blackening of the lines of the homologous pair in the spectra of the standard).

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