Yttrium speciation variability in bauxite residues of various origins, ages and storage conditions.

Bauxite residues (BRs) are highly alkaline wastes generated during alumina production from bauxite ore. Billions of tons have been accumulating worldwide for more than 100 years, they are stored in various forms, and pose environmental and societal issues. At the same time, BRs are promising secondary sources for the production of critical metals including rare earth elements (REEs).

Cerium stable isotope analysis of synthetic and terrestrial rock reference materials by MC-ICPMS.

Cerium is the most abundant rare earth element (REE) in the solar photosphere, CI chondrites, and the Earth. It has four main stable isotopes (masses: 136,138,140, and 142), with Ce being the most studied species, used in geochronology and petrogenesis. In addition, more abundant Ce and Ce are suggested to be potentially applicable in geochemical investigations.