Известия Томского политехнического университета: Инжиниринг георесурсов (Aug 2018)
Polycyclic aromatic hydrocarbons in soils of industrial and residential areas of Tyumen
Abstract
The relevance of the research is caused by the necessity to study the poorly investigated features of the priority polycyclic aromatic hydrocarbons accumulation in the urban topsoil of the city areas described by various functional purposes and industry. The main aim of the research is qualitative and quantitative assessment of the topsoil contamination in the residential and industrial areas of the city according to the polycyclic aromatic hydrocarbons composition and content observation. Objects of the research are urban topsoil undisturbed horizons (0-10 cm) of urban soils. Methods: soil sampling; methods for determining physical and chemical properties of soils, extraction of polycyclic aromatic hydrocarbons by saponification, high/performance liquid chromatography with fluorimetric detection using 1260 Infinity device made by Agilent (USA), statistical methods, calculation of diagnostic ratios of polycyclic aromatic hydrocarbons, hygienic and geochemical parameters. The results. The contents of 12 priority polycyclic aromatic hydrocarbons were determined in anthropogenically altered soils: naphthalene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenzo[a,h]anthracene, benzo[ghi]perylene. A wide variability of their content in urban topsoils is shown. It has been established that the increased contents of benzo[a]anthracene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene and benzo[ghi]perylene determine soil contamination in the residential area, and fluorene, phenanthrene, benzo[a]anthracene and benzo[k]fluoranthene - in the soils of industrial areas. It was revealed that, on average, the total content of polycyclic aromatic hydrocarbons is twice higher in the soils of the residential area than in the soils of industrial areas. This is due to both the physical and chemical properties of soils, and the duration and intensity of anthropogenic impact. An integrated assessment of pollution showed a dangerous level of soil pollution in the residential area, moderately dangerous - in the Antipinsky Refinery impact area and the permissible - in the CHP-2 plant impact area.
