The in-situ characterization of salt in MSRs is normally done using electrochemical spectroscopy (ECS). . The advantage of ECS is the relative ease in accessing the salt during reactor operations. However, ECS is a low-resolution method that results in broad element-specific peaks. In multi-component solutions, possible overlapping peaks will result in information loss. On the other hand, high-resolution X-ray absorption spectroscopy (XAS) is an extremely sensitive atom-specific method that could augment the low-resolution but accessible ECS.