AI Article Synopsis
- Proton NMR relaxometry is a technique used to measure the iron redox ratio in slag samples by analyzing how iron ions affect water relaxation times.
- Experiments were conducted to establish a correlation between the concentration of Fe and Fe ions and the relaxation times of standard samples, revealing distinct effects of each ion.
- The consistency of results obtained from NMR, wet chemistry, and Fe Mössbauer spectroscopy suggests that the NMR relaxometry method is a reliable approach for determining the iron redox ratio in slag.
Article Abstract
Proton nuclear magnetic resonance (NMR) relaxometry is proposed to determine the iron redox ratio of slag samples. It depends on the paramagnetic effect on bulk water relaxation times. Experiments have been carried out to calibrate the relationship between the concentration of Fe and Fe ions and the measured relaxation times on prepared standard samples. It is shown that Fe ions have very different effects on the relaxation times than Fe ions. For the solid slag samples, digestion in an acid was used to produce solutions with a pH of 1.0. Hydrogen peroxide (HO) was then added to the digested samples to oxidize Fe ions to Fe ions. The concentration of Fe and Fe ions in solution can be calculated by measuring the relaxation times before and after oxidation. The Fe/∑Fe ratio of slag samples was also investigated by wet chemistry and Fe Mössbauer spectroscopy and calculated by FactSage at the equilibrium state. The results obtained from different methods are consistent, indicating that this NMR relaxometry method is reliable.
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| http://dx.doi.org/10.1021/acs.analchem.4c02681 | DOI Listing |
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