Geochemical characteristics and normalized patterns of rare earth elements (REE) have been studied in 16 water samples collected from rivers and lakes in temperate and boreal regions of Russia. It is shown that the studied waters exhibit a typical REE pattern, with light REE being more abundant than heavy REE. The positive correlations between REE concentrations and dissolved organic carbon and iron in lake waters are moderate to high, indicating a potential role of organomineral colloids in REE transfer. Anomalies of Ce due to its oxidation on the surface of Mn oxides and Fe oxyhydroxide colloids and of Eu, which is associated with the contribution of groundwater to the nutrition of the studied rivers and lakes, are recorded in some of the studied reservoirs.
Drozdova et al. (Sun,) studied this question.