Rationing of elemental and polyelemental pollution of soil by heavy metals with mpc

Summary. Raising of problem. According to biological functions, such as fertility, balance support of the energy, gas in atmosphere, water, soil is an indispensable and irreplaceable component in the urban ecosystem, something, firstly, plays role a link between its other abiotic and biotic components and, secondly, serves biogeochemical barrier to the migration of the various toxicants. In the urban ecosystems, the most dangerous pollutants are heavy metals (HM), conventionally, this group includes elements with an atomic mass of 50 a.m.u. (Ni, Cu, Zn, Cd, Pb, Hg and others). They have properties of metals or metalloids and are toxic to the humans and biota. Therefore, rationing of a rationing of the elemental and polyelemental pollution of the urban soil by HM has great scientific and practical importance for the sustainable development of megacities. It allows setting the level of danger according to the sanitary indicators for the population. Purpose. Conduct a rationing of excess content of HM in the urban soil using hygienic indicator - MAC by comparing the conformity assessment element and polyelement pollution on the example of Dnepropetrovsk. The ecological monitoring network has been formed by applying a grid (2 km × 2 km) on territory for ecological assessment of soil pollution of Dnepropetrovsk urboecosystem by HM. It is possible to identify 65 key sampling sites. The total content of Cd, Pb, Zn, Cu and Ni was determined in selected samples by the atomic absorption method after acid treatment of the soil. Rationing of the elemental and polyelemental pollution by HM was conducted according to the degradation degree and polyelement ? using soil pollution index (SPI). Conclusion. Research confirmed the need for the application of the sanitary and hygienic standards ? MACs for rationing of the urban soil pollution by HM, because this makes it possible to set the danger degree to the public health. There are some hotspots wits Cu, Zn and Pb on the territory of Dnepropetrovsk. The categories of problem and polluted soils by HM have been found by imposing values of SPI. The determination of SPI as the average of the elements summation negates the multiplicity of toxic groups of the certain HM, therefore, proposed integrated total index does not necessarily reflect the danger degree in case of the violation of hygienic standards.