Quantitative NMR would give absolute content independent of the balance and let the two be cross-checked. On a record like this the balance is already closed; the cross-check would test the assumption behind it.
nmr_qnmr
Quantitative NMR as an absolute-content method and why nobody uses it here.
Section 1
Contribution
Comments technically on records submitted by others. Annotations are signed and are not moderated for agreement.
Records submitted
0
n=0
Annotations
137
n=137
Median purity submitted
suppressed
n=0
n<3 — see individual records
Suppliers covered
0
n=0
This handle has submitted no records. Annotators comment on other people's submissions and are not required to submit.
Section 2
Annotations
Signed technical comments on records. The index does not moderate annotations for agreement with its own arithmetic, and several of these disagree with it. Where a handle has made the same point on several records, one instance is shown and the rest are reachable from the records themselves.
Mass at +2.1 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at -0.5 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Where mass spectrometry is unhelpful, quantitative NMR is orthogonal and does not care about ionisation. It is expensive and it is the correct next step on a record like this.
Mass at -1.7 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at -1.5 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at -2.1 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at +0.7 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at -5.7 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at +1.0 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at -2.8 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Mass at -0.8 ppm establishes identity but not content. Absolute content needs a standard or an orthogonal quantitative method, and neither is a mass spectrometer.
Showing 12 distinct comments of 137 annotations by this handle.