G - Physics – 01 – R
Patent
G - Physics
01
R
324/1
G01R 33/46 (2006.01)
Patent
CA 1064578
QUANTITATIVE ANALYSIS OF NUCLEAR MAGNETIC RESONANCE SPECTRA HAVING SOLVENT PEAKS Abstract of the Disclosure A method is described for the quantitative analysis of a solution in which the solvent produces a nuclear magnetic resonant (NMR) spectral peak that dominates the system. A first spectrum containing the peak is made by operation of a nuclear magnetic resonant spectrometer at a first gain setting. The NMR apparatus is a pulse-modulated, Fourier-transform type spectrometer. A second spectrum is produced in which a 180° pulse is applied to invert the spectral component magnetization followed after a period of time by a 90° pulse. The period of time is sufficient to allow the solvent or component producing the unwanted peak to relax from the inverted state to a point where there is minimum magnetization along the longitudinal axis. At this point, in many solutions the other components have completely relaxed so that the 90° pulse produces a free induction decay signal which, after undergoing the Fourier-transformation, yields a spectrum that does not include any significant peak due to the solvent. Thereafter, the quantitative analysis is performed by measuring the areas under the respective component peaks and simultaneously solving a series of equations in which the weight of the various components is proportional to the respective areas under the peaks and to gain settings of the spectrometer.
291864
Hofer Donald C.
Kahwaty Vincent N.
Valentino Carl R.
International Business Machines Corporation
Na
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