How to find integrated peaks on NMR graphs

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SUMMARY

This discussion focuses on the methodology for finding integrated peaks on NMR (Nuclear Magnetic Resonance) graphs, particularly in the context of Modern Analytical Chemistry. The key takeaway is that integration begins at the point where the peak deviates from the baseline for baseline-resolved peaks. For overlapping peaks, the integration starts at the midpoint between adjacent peaks. This approach provides a practical, albeit approximate, method for determining peak ratios in NMR analysis.

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  • Understanding of NMR spectroscopy principles
  • Familiarity with peak integration techniques
  • Knowledge of baseline resolution in analytical chemistry
  • Experience with interpreting NMR graphs
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  • Learn about baseline resolution techniques in analytical chemistry
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Chemists, analytical scientists, and students studying Modern Analytical Chemistry who are looking to enhance their skills in interpreting NMR graphs and performing peak integrations.

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Hi all,

I am currently self studying a chapter on Modern Analytical Chemistry. One part talks about interpreting NMR graphs and I understand the basic gist of it, however, I don't understand how to find the integrated peaks. I've looked extensively online and I now understand that you have to measure the peaks to find the ratio. BUT, how do you know where to start and stop measuring?

An example is http://www.wfu.edu/~ylwong/chem/nmr/h1/integration.html" , if you were to click on the animated flash explanation, they show how it's done, but I don't understand how they came up with where to start and stop the measurement of the peaks.

Thank you in advance!
 
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If the peaks are baseline resolved, the integration begins where the deviation from the baseline into the peak begins. If peaks are not baseline resolved, a midpoint between adjacent peaks is used. It isn't exact, BTW, but it gets you close.
 

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