Abstract
Purpose. Analysis of the distribution of mercury concentrations in the whole district; identification of links between mercury content and other toxic and potentially toxic elements, petrographic composition of coal and its main technological parameters. Methodology. The methods of mathematical statistics with the construction of histograms of distribution and dendrograms of clustering of coal seams of the region by Hg concentrations are also used in the work. Results. Peculiarities of distribution and the nature of mercury distribution in 56 coal seams, which belong to the suites С14, С21, С22, С23, С25, С26, and С27 of the lower and middle divisions of the coal period of the Krasnoarmeysk geologicalindustrial area, have been determined. Simple and cumulative histograms are constructed and analyzed. The calculations of the weighted average concentrations in the coal of the main layers and suites were performed, the composition of the typomorphic geochemical association of mercury with other toxic and potentially toxic elements in the coal of the region is clarified. The main factors influencing the mercury content in the nearest stratigraphic section of coal seams in the process of coal accumulation and epigenetic transformations of the coal seam were significantly varied. The average value of mercury content in coal of the main working seams of the area is significantly below the maximum allowable concentration in coal. In the district as a whole, there is no significant connection between mercury concentrations and ash content and sulfur content of total coal, at the same time there is an increase in mercury content with increasing degree of coal carbonization. Scientific novelty. The nature of the distribution and the main statistical indicators of mercury concentrations in the main coal seams and suites of the Krasnoarmeysky geological-industrial region of Donbass were established. A typomorphic geochemical association of mercury with other toxic and potentially toxic elements in the coal seams of the district has been established. Practical significance. The practical significance of the obtained results is to identify the absence of a significant relationship between mercury concentrations and ash content and sulfur content of total coal, as well as to calculate the regression equations between the elements included in the geochemical association with mercury. Key words: mercury, mine, coal height, coal ash content, depth, sulfur content, regression equation, correlation coefficient.
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