USING OF THE MATHEMATICAL STATISTICS METHODS FOR THE CHARACTERISTIC OF THE ELEMENTAL CONTAMINATION URBAN ECOSYSTEMS SOILS BY THE HEAVY METALS

Sustainable development of the urban ecosystems, taking into account the provision of ecological safety standards for the human life within the city and the rational use and restoration of the resource potential of the territory, requires the search for effective methods of the characteristic of the ecological situation. In the conditions of the progressive pressure to the environment, the leading role belongs to the mathematical statistics methods, as a tool that allows us to examine and analyze in detail ecological systems of the various complexity. Of all the environmental abiotic components, soils have been given the least attention, which is due, firstly, to the ambiguous characteristic of the environmental situation according to the total content of the contaminant, and secondly, to the problem of choice its additional forms for the statistical analysis. Purpose. Substantial using of the mathematical statistics methods in the ecomonitoring system along with the generally accepted for the characterization of the elemental soil contamination of the urban ecosystem by the heavy metals, by determining the statistical characteristics and establishing relationships between the total content, potentially available and available forms by the example of Zn contamination in the Dnieper. The total content, potentially available and available forms have been used to determine the elemental Zn contamination. An array of the content data of the studied Zn forms has been obtained in the network of ecological monitoring of soils of the Dnieper urban ecosystem: grid (2 km × 2 km), key sampling sites – 65. In the selected samples, the Zn total content yas been determined by the atomic absorption method after acidizing the soil, its potentially available forms in the extraction of 1 H HCl, and the available forms in AAB (pH 4.8) by standard methods. The mathematical statistics methods and the application package Microsoft Excel 2010 has been used to determine the patterns of Zn distribution of the across the territory. Conclusion. The using of the mathematical statistics methods for characterizing data sets, as primary values, has been scientifically confirmed in the block for estimating the ecomonitoring system of the heavy metals contamination of the urban ecosystems soils. The intensive technogenic Zn contamination soils of the whole Dnieper territory according to the total content and the increase in the contamination variegation by the potentially available and available forms have been revealed using statistical methods and in the rationing of the sanitary- hygienic (MAC) and ecological indicators (natural geochemical background). A close correlation has been established between the total Zn content in the soils of Dnieper urban ecosystem and the potentially available forms, in contrast to the available forms, where it has been not observed, which indicates a selective loss of buffer mechanisms relative to Zn.