ELEMENTAL COMPOSITION AND SOURCES OF URBAN DUST OF А LARGE INDUSTRIAL CITY (KRASNOYARSK, RUSSIA)

For the first time, a comprehensive study of urban dust collected in Krasnoyarsk city was carried out. The results obtained enabled the features of elemental composition of urban dust and their natural and anthropogenic sources to be investigated. Dust samples (n = 68) were collected in different functional areas of the city. The content of 70 elements was determined in the collected samples of urban dust. The diagrams of the (CaO + + Na2O) – Al2O3 – K2O and (CaO + Na2O + K2O) – Al2O3 – (Fe2O3 + MgO) composition showed that the mineral part of most of the studied Krasnoyarsk dust samples is represented by plagioclases. Values of enrichment factors and geoaccumulation indices showed contamination of Krasnoyarsk dust by Co Sn, Bi, Pb, Mo, Cu, As, Zn, Cd, W, Ag and Sb. Regularities of microelement accumulation depending on sampling locations were found. Sb accumulates to a large extent in samples collected on major highways of Krasnoyarsk, while elevated contents of As, Cu and Co are typical for samples collected in industrial areas of the city. The principal component analysis and Pearson matrix allowed to identify 6 groups of elements in the dust samples, which can be attributed to various natural and anthropogenic sources: Al, Ti, Cr, Fe and Ni – weathering of soils and rocks; Fe, Co, Ni, Cu and As – emissions from metallurgical plants and coal-fired thermal power plants; W, Bi, Zn and Mo – heavy metallurgical and mechanical engineering industries; Cu, Cd, Sn and Pb – emissions from motor and rail transport, as well as wear of metal parts and structures; Sn and Sb – wear of brake pads and tires and industrial emissions; Hg – weathering of soils and rocks.