NMR spectroscopy is an analytical method which helps to study the behavior of specific nuclei of a molecule in an external magnetic field. The data which are generated during the experiments contain various information about the different molecules within a solution.
For instance it contains information about the structure, like bindings and the presence of isomers, but also information of the quantity of a particular molecule. The NMR signal, its shape, frequency (position in the spectra) and couplings are characteristic for a particular compound and can therefore be used to identify it. The intensity of the NMR signal of a specific nucleus in a molecule is directly proportional to the concentration of the molecule within the solution and can thus be used to quantify the compound.
Read more about it in our white paper about the results of an interlaboratory proficiency test: