Академическое издательство «Гео»

Keywords: urban soils, heavy metals, pollution zones, dispersion halo, pollutant elements.


Assessing technogenic pollution of soils in Blagoveshchensk

L.P. Shumilova


Technogenic pollution of soils of Blagoveshchensk (Amur oblast) by heavy metals has been investigated. An increase in technogenic pressure on urban soils is accompanied by a decrease in organic carbon content, alkalinization and phosphatization of soils. The main pollutant elements of urban soils include lead, zinc and cadmium. Lead and zinc showed an exceedance of MAC for mobile fractions of heavy metals in soils of the industrial and residential-transport zones. Analysis of the gross content of heavy metals showed an exceedance of the approximate permissible concentration (APC) only for lead in soils of the industrial zone; zinc content reaches the APC level. The study revealed soil pollution levels in Blagoveshchensk by heavy metals according to the index of total pollution. Maps were compiled, highlighting zones of soil pollution by the main pollutant elements as well as zones of polyelement pollution. A zoning the urban territory by the method of ecological mapping indicated that the main sources of urban soil pollution by heavy metals are the enterprises of the fuel and energy complex: thermal power plants, private housing sector heated with coal as well as motor transport. The study revealed pollution zones and dispersion halos of heavy metals. The zone with a high, hazardous pollution level extends from thermal power plants along the northwestern direction of the prevailing movement of air masses (according to the wind rose) encompassing the urban center. Most of the territory is covered by the zone with a medium, moderately hazardous soil pollution level. The zone with a permissible, low pollution level is located along the direction opposite to prevailing winds, in the northwestern part of the city.

Keywords: urban soils, heavy metals, pollution zones, dispersion halo, pollutant elements.