Correction of Q Factor Effects for Simultaneous Collection of Elemental Analysis and Relaxation Times by Nuclear Magnetic Resonance.
| Autor: | Widgeon Paisner S; Materials Science in Radiation and Dynamics Extremes, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Janicke MT; Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Kaseman DC; Bioenergy and Biome Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Frankle RK; Bioenergy and Biome Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Yoder JL; Bioenergy and Biome Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Alvarez MA; Bioenergy and Biome Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Espy MA; Non-destructive Testing and Evaluation, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Williams RF; Bioenergy and Biome Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States. |
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| Jazyk: | angličtina |
| Zdroj: | Analytical chemistry [Anal Chem] 2020 May 19; Vol. 92 (10), pp. 6918-6924. Date of Electronic Publication: 2020 May 07. |
| DOI: | 10.1021/acs.analchem.9b05603 |
| Abstrakt: | A new method for measurement of elemental analysis by nuclear magnetic resonance (NMR) of unknown samples is discussed here as a quick and robust means to measure elemental ratios without the use of internal or external calibration standards. The determination of elemental ratios was done by normalizing the signal intensities by the frequency dependent quality factor ( Q ) and the gyromagnetic ratios (γ) for each measured nucleus. The correction for the frequency dependence was found by characterizing the output signal of the probe as a function of the quality factor ( Q ) and the frequency, and the correction for γ was discussed in a previous study. A Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence was used for evaluation of the relative signal intensities, which allows for derivation of elemental ratios, and was correspondingly used to simultaneously measure the T |
| Databáze: | MEDLINE |
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