Abstract
The use of the effect of a decrease in the transverse relaxation time T2 of the NMR signal of water protons in the presence of magnetic particles has been suggested for the quantitative estimation of the concentration of magnetite (Fe3O4) nanopowder in water. A calibration dependence of the relaxivity T2−1 on the iron concentration has been obtained for model suspensions of magnetite nanoparticles with sizes of approximately 20 nm in the concentration range of 0.15–70 mg/L. For comparison, the concentration dependences of T2−1 for aqueous solutions of Fe(NO3)3 · 9H2O and FeSO4 · 7H2O and paramagnetic salts Ni(NO3)2 · 9H2O, Cr(NO3)3 · 9H2O, and CuSO4 · 5H2O have been studied to show that they correlate with their paramagnetic susceptibilities.
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