12. Determine the percentage of chromium in steel, if the following data are obtained during photometry:
Reference 1 2 3
СCr, % 0.50 1.23 4.17
SCR 0.07 0.29 0.86
SFe 0.27 0.15 0.27
The analyzed sample has SCr=0.73 and SFe=0.33. (S-blackening of the lines of a homologous pair in the spectra of the reference)
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