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THE STABILITY OF FROZEN SOILS IN CONDITIONS OF DEVELOPMENT OF MINING INDUSTRY
Abstract
This paper aims to identify the degree of resistance of cryogenic soils exposed to chemical contamination from the Nurbinsky extractive plant in Western Yakutia. It examines the resistance basing on the sorption capacity of soil material, and also assesses their ecological and geochemical state. In this paper we consider homogeneous suprapermafrost-gley, gley podzolized and homogeneous non-gley types of cryozemes. A total of 16 full-profile soil cuts and 185 small trenches were made in depth of 0-10 cm and 10-20 cm during the 2007-2014. In general, 334 samples of soil material were collected from the territory of the industrial site of Nyurbinsky extractive plant. Microelements were grouped into three clusters according to content of mobile forms and characterization of intraprofile distribution. For the elements of clusters I (Mn, Cu, Zn, Cd) and II (Co, Cr, Ni) the major criteria affecting the sorption are physical clay content and capacity of cation exchange. The main sorbent for elements of cluster III (As, Pb) is organic substance. We conclude that homogeneous suprapermafrost-gley cryozem and homogeneous non-gley cryozem have high sorption ability and low resistance to chemical pollution. While the gley podzolized cryozem has low sorption ability and high resistance.
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References13
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