Discussion
What is the main use of quantitative NMR against an internal standard?
Answer: B
Because signal area is proportional to the number of nuclei, a weighed certified standard in the same tube gives the purity of the analyte without needing a pure sample of the analyte itself. That is a real advantage over chromatography, which needs a calibrated reference for every compound measured. Fragment ions belong to mass spectrometry, trace metals to atomic spectroscopy, and NMR separates nothing. The method demands a long relaxation delay and careful integration, but it has become a primary technique for reference material certification.
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