Published on 30 July 2019
This article is devoted to the problem of waste soil pollution of "Tuvakobalt" mine, Republic of Tyva. The problem has not lost its relevance since the closure of the plant in 1991. A major threat to the adjacent areas and nearby communities is represented with 5 cards-waste of hydrometallurgical redistribution of arsenide-cobalt-nickel ores of Khovu-Aksinskiy field. The aim of the work is to assess the degree of soil contamination with heavy metals and arsenic, to identify the possibility of the additional remediation activities. The area under research is confined to a small Elegest-Ungesskiy basin located in the spurs of the Eastern ridge of TannuOla in the upper reaches of the Elegest river (Central Tuva). Totally 51 soil samples were selected: from the surface of the waste disposal maps of the plant, from the adjacent area and from the background area (35 km to the South-West and 25 km to the North of the plant). The content of organic carbon, the fraction of physical clay, pH was determined in the samples. Gross concentrations and mobile forms of nickel, copper, cobalt and cadmium were determined by x-ray fluorescence analysis and atomic absorption spectrometry. The gross amount of arsenic was determined by the AAS method, in part of the samples – by photometric method. To identify the ability of soils to inactivate heavy metals and arsenic, the soil buffering was evaluated by the method of Ilyin V. B. The concentration coefficients of elements, the total pollution coefficient (Zc) and the radial differentiation coefficients were calculated. According to the research results the greatest soil pollution was observed in the area near the plant facilities and waste disposal maps. The assessment of buffering shows that the established level of accumulation of pollutants in soils is 10 background values. In general, for the studied area the level of pollution is defined as low, near the maps – average. The concentrations of heavy metals and arsenic in soils are characterized by significant variability both in the territories adjacent to the waste maps and in the soils of the background. At the same time, Nickel, cobalt and arsenic concentrations stand out significantly, which well reflects the Association of the main components of the ore of the Khovu-Aksinsky deposit. In the substrate of uncovered maps elements are present in the abnormally high concentrations. Significantly less in their content, but many times higher than in the clark they were revealed in the soil remediated cards, proving the need for the re-remediation.
Tags: тяжелые металлы, почва, отходы горнодобывающих предприятий, оценка загрязнения почв.
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)