Rare earth elements in soil of natural and technogenic landscapes of Kirov region

The content and distribution of rare earth elements (REE) in soils of natural and technogenic landscapes of Kirov region was studied. It is shown that in natural landscapes of the northern part of Kirov region the content and properties of soil-forming rocks, in particular the role of morainic material in forming soil profile, influence the content and amount of lanthanoides in soil. The amount of REE in soil vary from 50 to 145 mg/kg. In soil-forming rocks with the moranic part, as well as in soils formed on it, REE concentration is lower that in soil on residual deposit clay, there is a tendency to accumulating heavy lanthanoides. In agro-sod-podzol soil on residual deposit clay eluvial distribution of REE in the profile was stated, in soil on moranic material lighter lanthanoides from Се to Tb accumulate in the plough layer, while heavy lanthanoides (Dy-Lu), as well as Y and Sc, get washed out from the surface soil layer. In technogenic soil formed in the Vyatka valley near Kirovo-Chepetsk REE amount in soil vary within a wider range, from 29 to 245 mg/kg. At clay normalizing on the Russian Platform the amount of light lanthanoides decrease, while heavy ones increase. In swampland soil europium anomaly takes place, which is caused by the dependance of the element on oxidation-reduction conditions. Concentration of some REE in soil formed in dumping sites is 2 times higher than percentage abundance, which can be estimated as a low degree of soil contamination with REE.