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PhD, Associate Professor** O. S h a p o v a l o v PhD** I. S h a s h a Doctor of Technical Sciences** V. D e m i a n y s h y n PhD** A. D e m c h e n k o PhD Department of organization of scientific activity Cherkasy Institute of Fire Safety named after the Heroes of Chernobyl Onoprienka str.,

Abstract. The study of geochemical aspects of the transformation of migration properties of heavy metals under the influence of anthropogenic loading of pyrogenic origin has been given insufficient attention. We studied the concentration of heavy metals in soils by atomic absorption analysis. The results indicate the transformation of their migration properties. The diversity and versatility of behaviour of chemical elements in environmental components after fire was noted. In different ecological conditions, it is possible to observe a wide range of quantitative values of geochemical migration or accumulation of any particular chemical element. The analytical results show that the contents of migrant elements, pH values, areas of disasters which are approximately in the same conditions, but passed by the grass or upper fire differ quite tangibly. Heavy metals that hit the environment can form difficult soluble hydroxides. In addition, in the soil solution, there is a probability of the formation of hydroxocomplexes with different amounts of hydroxide ions by metals. The range of precipitation of hydroxides and the region of predominance of soluble hydroxocomplexes have been studied by constructing concentration-logarithmic diagrams. On the basis of the calculations it can be argued that the influence of technogenic loading of pyrogenic origin influences the geochemical migration of heavy metals . Compounds Fe 3+ at the pH = 4.5-14, Cu 2+ at pH = 7-14, Cr 2+ at pH = 7-9, Zn 2+ at pH= 8-11, Ni 2+ at pH = 8-14 have the lowest migration potential. Compounds Pb 2+ at pH = 9-12, Fe 2+ -pH = 9.5-14 have the lowest migration potential also. In a more acidic environment, soluble substances are formed, but at a pH increase of only 0.5-1, they can decrease their mobility by an order of magnitude which contributes to their concentration in the soils after the fire. In a neutral soil reaction, most of the heavy metals (Al, Cr, Zn, Cu, Fe (II), Ni) are in a slightly soluble form (in the form of hydroxides), with insignificant, migration capacity which leads to the accumulation of these chemical elements in the soil. It is necessary to allocate heavy metals moving in a neutral environment (Fe (II), Cd, Co, Mg, Mn) into a separate group. Any increase in pH values contributes to their fixation. The obtained calculations can be used to predict the geochemical migration of heavy metals in soils which result from anthropogenic disasters of a pyrogenic origin. України, Харків, Україна, e-mail: asotskiy@nuczu.edu.ua 3 Харківський національний автомобільно-дорожній університет, Харків, Україна, e-mail: alenauvarova@ukr.net 4 Національний університет цивільного захисту України, Харків, Україна, e-mail: prv1984@ukr.net Aнотація. Дослідженням геохімічних аспектів трансформації міграційних властивостей важких металів за впливу техноген-ного навантаження пірогенного походження приділено недостатньо уваги. Проведено дослідження концентрації важких ме-талів у ґрунтах методом атомно-абсорбційного аналізу. Результати вказують на...

The purpose of this study is geoecological analysis of the risk of natural fires and other emergencies of an ecological nature based on the location of high-risk objects in the territory of the Kharkiv region. The following tasks were solved in the work: calculation of the risk of an ecologically dangerous event depending on the density of placement of objects of high danger in the region; Creation of a chart-map on the level of danger of environmental threat in the districts of the region; the search for the dependence of the area of forest fires on the density of the population, the number of high risk facilities, etc. An analysis of the influence of anthropogenic factors on the occurrence of natural fires on the example of the Kharkiv region was carried out. Distribution of potential risk and population density in the studied area allows us to obtain quantitative estimation of social risk for the population. Excessive population density in some areas of the region is one of the factors that increase the material and social risk of the territory and population of the region from natural disasters and man-made disasters. We created mapping zoning of multi-level districts of the region, the risk of an emergency reflects the patterns of spatial structure of potential sources of emergency situations and allows to increase the readiness of the executive and authorized services to act in the event of sudden emergencies and to act for their prevention. Available data allowed us to estimate the density of the placement of potential sources of man-made emergency situations for all districts of the region, which gives us the right, with a certain degree of conditionality, to speak about the extent of the technogenic danger of the territory of the studied areas of the Kharkiv region. We propose to apply a complex factor taking into account the population density, density of placement of objects of high danger and the proportion of high risk objects in the area of the forestry organization in comparison with the total number of objects in the region. For the simultaneous evaluation of both natural and anthropogenic conditions of forest fires in the region, we propose to use the methodology of scoring on which they are evaluated in a four-point system, taking into account the five main characterizing indicators : population density; forest area; the density of high risk facilities; climatic and weather conditions; the share of high risk facilities. Comparison of information on the average number of fires on the lands of the forest fund of Kharkiv region over the past ten years with the results of our typology of the areas shows some correlation. The results of studies on the assessment of the risks of the occurrence of fires depending on natural and anthropogenic factors can be used for zoning similar areas and forecasting the fire situation.

The objective of the study was the composition of ash and slag waste from the Zmiiv TPP (thermal power plant) and the peculiarities of migration of heavy metals (HM) from the place of storage of ash and slag waste into the ecosystem. To achieve this goal, the following tasks were solved: chemical analysis of ash and slag waste of the Zmiiv TPP; identification of the probability of HM migration into the soil environment in the places of ash and slag waste storage. Ash and slag of the Zmiiv TPP contain Cu, Cr, As, Cd, Ni, Pb in quantities several times higher than the threshold limit value (TLV). For ash and slag wastes, the total pollution rate was Zc = 43, which corresponds to a high level. That is, this artificial horizon is dangerous. HMs migrate to groundwater and soils near the ash stockpiles as a result of infiltration of precipitation waters, leaks from water-bearing communications, water filtration through the base of the ash stockpiles of the Zmiiv TPP. To determine soil contamination near the ash stockpiles, we analyzed soil at the distances of 0, 5, 10, 50 and 100 meters. The contents of the HM decreased further away from the stockpiles. At the distance of up to 100 meters from the dump, there were excesses of the threshold limit values for Ni, Cu, As, Cr in the soil. The concentration factor exceeded one for Cr, As, Cu, Cd, Ni. Only at the distance of 100 meters did the contents of Pb and Zn reached the background values. The calculation of the total rate of soil contamination allowed us to classify these soils as moderately dangerous and acceptable. However, the Zn indicator has several significant disadvantages, particularly it does not take into account the differences in the potential hazards of the elements, as well as, most importantly, the synergistic effects of polymetallic pollution. The coefficient of synergistic effect of heavy metals was 26.64 (in the soil of the ash stockpiles), then decreased, but even at the distance of 100 meters it equaled 11.23, i.e. at the distance of 0... 100 m from the ash stockpiles, the overall actions exceed the norm. The study revealed that Cu, Ni, Zn and Cr had low mobility in the soil near the ash stockpiles and therefore accumulated near the stockpiles, which may be explained by neutral and slightly alkaline soil pH values. The ratio of mineral phases and glass varied, but we should note the predominance of aluminosilicates, calcium silicates and glass in the ash and slag wastes. Heavy metal compounds are confined mainly to amorphized clay aggregates and soot-coal ash formation, to a lesser extent to slag glass and even less to grains of quartz sand. Since ash contains such fractions that can be easily carried by the wind, it should be assumed that ingress of HM into the ecosystem occurs by air, which also contributes to air pollution. The solution to the problem of ash and slag waste disposal can be found in their utilization in the production of construction materials, in road construction, but it is necessary to study the composition of ash and slag and the probability of migration of HM depending on the conditions of use.