62(2). control in the production of ammonium nitrate is carried out by absorption in the IR spectrum at 2.14 μm. Determine the mass fraction (%) of NH4NO3 using the following data obtained by the baseline method for standard and test solutions:
Absorption intensity
Standard solutions Test solutions
w,% 70.0 75.0 80.0 85.0 2
I 11.9 10.2 9.1 7.6 10.7 10.3
I0 15.3 16.1 17.5 17.8 18.8

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