Zharikova Y.A.
Вестник Алтайского государственного аграрного университета 2018; (5): 59-65
Rare and rare-earth elements are widely used in industry, they are contained in mineral fertilizers in the form of impurities, lanthanides are used as feed supplements and growth promoters in poultry and pig farming. The widely observed increase in the content of these elements in soil, water and food products pose negative environmental impacts. The research goal was to reveal the features of native and arable soil composition of Kamchatka in terms of rare and rare-earths elements. Environmental assessment of heavy metal content in volcanic soils is not always correct due to differences in the profile distribution of substances, bulk density and other properties. Therefore, to obtain a true picture, the reserves of elements in the root layer of 0-20 cm were calculated. The content of the investigated elements in soil surface layer differs slightly, while the reserves of all the elements in arable soils are higher than in virgin soils. The intensive use of phosphorus fertilizers and deoxidizers that contain rare and rare-earth elements as impurities is a probable cause of such accumulation. The largest reserves of Nb, Y, Rb, and Zr are found in the Western Kamchatka soils. The soils of East Kamchatka are distinguished by large reserves of Sc and La. The reserves of most elements studied are the lowest in the soils of Central Kamchatka. The accumulation of Sc and La in surface soil layers, the stability of Cs and leaching of other elements is the geochemical feature of the region. The content of rare and rare-earth elements in Kamchatka soils exceeds the clarks in the world soils, or is comparable with it (except for Rb and Zr).
