Bob Albrecht

Questions and Answers (2) View all

• Answer added in 1H-NMR
  36 Is a NMR concentration sensitive or mass sensitive?
  By Shengyuan Xiao · Beijing Institute Of Technology
  Bob Albrecht · Delaware State University

  Mass sensitive 

  Mass sensitive
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• Answer added in Solid State Characterization
  6 How do we compare two NMR spectra (Solid state) of different amounts for two different compounds if the number of scans are also different?
  By Vasantha Gowda · Indian Institute of Science
  Bob Albrecht · Delaware State University

  In order to quantitate properly you first need to make sure that autogain is not enabled. If your NMR system is using autogain it will be difficult to... [more]

  In order to quantitate properly you first need to make sure that autogain is not enabled. If your NMR system is using autogain it will be difficult to compare spectra. Because NMR is essentially an nuclei counter, for two samples with the same number of scans the signal will be proportional to the number of nuclei at a particular chemical shift for the sample in the observable region of the NMR probe. You can directly compare the first N scans where N is the lower number of scans for the two samples. Also, the signal strength is proportional to the number scans, and by analyzing the signal strength for 1,2,4,8,16... scans you can come up with a relationship for number of scans vs. the integrated area of the signal.
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