Integration of peaks

It IS important to remember that integration of peak areas gives relative not absolute proton counts Thus a 3 2 ratio of areas can as m the case of CH3OCH2CN correspond to a 3 2 ratio of protons But m some other compound a 3 2 ratio of areas might correspond to a 6 4 or 9 6 ratio of protons... 

Therefore, multiplicity and the relative peak heights in a multiplet provide an useful additional check on the relative number of protons obtained from the integration of peak areas. 

Automatic integration of peak areas or peak heighl measure men Is, with a choice of several calibration methods for calibration of results. 

Predicting the Chemical Shifts, Multiplicity, and Integrals of Peaks in the H-NMR Spectrum of a Compound... 

Integration of peak areas in routine analysis is mostly achieved with electronic integrators. Two main problems arise from this evaluation technique first the definition of the baseline, and second, the determination of the time constant of the TLC-scanner and the integrator electronics. 

Peak height is not proportional to peak area. This common situation needs integration of peak area and... 

It Is possible to obtain quantitative data from the NMR spectrum Integral. Referring to Fig. 4, If the Integral of peaks designated b Is divided by 8 (the number of protons In the MDI contributing to this resonance), we have a number for the relative amount of MDI present, that la. 

---