Following the spatial distribution of a solid dissolving at an interface by high-resolution nuclear magnetic resonance spectroscopy

Abstract

The effects of the inherent magnetic susceptibility discontinuities found in heterogeneous systems on conventional high-resolution nuclear magnetic resonance spectra have been used to differentiate space near a phase boundary. The system studied is that of a solid dissolving at and diffusing from a liquid/liquid boundary. The concentration of the solute has been measured as a function of time and distance from the interface and the results obtained compared with those from a simple mathematical model of the system. As this technique makes use of the heterogeneities within a system, it has obvious applications where the effects of such heterogeneities make normal NMR analysis (either spectroscopy or imaging) very difficult.