Morphological diagnostics of soil-forming processes in the young soils of technogenic landscapes are considered. Comprehensive multilevel studies of soils developed on the tailings of coal mines of...

The biological activity of humic preparations in the form of sodium and potassium humates was investigated depending on the structural group parameters of humic acids (HAs): the degree of...

Link for citation: Volkova N.A., Ivanova I.S., Sokolov D.S., Kolubaeva Yu. V., Chuikina D.I. Concentrations and sources of polycyclic aromatic hydrocarbons in water and sediments of rivers of northern oil and gas producing territories of Western Siberia. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 4, рр.135-148. In Rus. The relevance. Huge reserves of both fresh water and hydrocarbons are concentrated on the territory of Western Siberia, the extraction and development of which is increasing every year. Oil is one of the main environmental risk factors for the natural ecosystems of the North. Among the components of oil, polycyclic aromatic hydrocarbons stand out, which have carcinogenic and mutagenic properties and have a negative impact on natural ecosystems. However, there are quite a lot of sources of these organic pollutants entering the environment, including they can be of both natural and anthropogenic origin. The relevance of the study of the content and composition of these components is caused not only by their toxicity, but also by their resistance to chemical and biological transformation, high migration activity and ability to accumulate in natural environments. The aim of this work was to study the individual composition and distribution of polycyclic aromatic hydrocarbons in water and bottom sediments of rivers, and to identify possible sources of polycyclic aromatic hydrocarbons entering water bodies of the Arctic zone of Western Siberia. Objects: river waters and bottom sediments taken from 8 watercourses in the territory of the Yamalo-Nenets Autonomous Okrug. The objects were chosen in such a way as to cover rivers of various orders within the catchment basins of the main rivers of the Yamalo-Nenets Autonomous Okrug. Methods. The content and individual composition of polycyclic aromatic hydrocarbons in water and bottom sediments of rivers was determined in the laboratory of physical and chemical studies of core and reservoir fluids of the Trofimuk Institute of Petroleum Geology and Geophysics SB RAS (Tomsk) using high-performance liquid chromatography. Statistical processing of the obtained data was carried out using the Microsoft Office Excel and PAST V2.17 software packages. Results. The features of the distribution of polycyclic aromatic hydrocarbons in water and bottom sediments of the rivers of the northern territories of Western Siberia have been studied. The total content of polycyclic aromatic hydrocarbons in the river waters of the YaNAO varies from 292,8 to 1098,0 ng/l. The minimum content of polycyclic aromatic hydrocarbons, represented mainly by low molecular weight compounds (mainly phenanthrene), associated with terrestrial higher vegetation, was established in the Mahanyad-Pusyakha River, which is a tributary of the Nadym River. The highest concentration of the studied compounds, represented mainly by high molecular weight polycyclic aromatic hydrocarbons, was identified in the water of the Apoku-yakha River, tested near the developed deposits and related to the catchment area of ​​the Pur River. The sources of identified compounds in this sample can be associated with both petrogenic and pyrogenic processes. The total content of polycyclic aromatic hydrocarbons in bottom sediments varies from 1900 to 20000 µg/kg, which is due to the presence of not only natural, but also anthropogenic pollution. The maximum concentration of these compounds was found in the bottom sediments of the Apoku-yakha River. Using statistical analysis, indices diagnosing polycyclic aromatic hydrocarbon sources were established: for water – ratios Flt/Pyr and (Pyr+BaP)/(Chr+Phen), for bottom sediments – ratios BaA/(BaA+Chr), Phen/(Phen+Chr ) and (Pyr+BaP)/(Chr+Phen).On the basis of the data obtained, it was found that polycyclic aromatic hydrocarbons enter the rivers, as a rule, from natural sources. The probable sources of polycyclic aromatic hydrocarbons entering bottom sediments can be divided into several groups: oil burning, combustion processes, as well as mixed sources. Polycyclic aromatic hydrocarbons identified in water and bottom sediments of the Apoku-yaha River have an anthropogenic genesis. The environmental assessment of the state of the rivers, based on the calculation of the polycyclic aromatic hydrocarbon hazard coefficient and the bottom accumulation coefficient, indicates a high level of chronic pollution of the studied objects. It was established that the most intense pollution is characteristic of the rivers belonging to the catchment area of the Pur River, where the most active hydrocarbon production takes place. Ссылка для цитирования: Концентрации и источники полициклических ароматических углеводородов в воде и донных отложениях рек северных нефтегазодобывающих территорий Западной Сибири / Н.А. Волкова, И.С. Иванова, Д.А. Соколов, Ю.В. Колубаева, Д.И. Чуйкина // Известия Томского политехнического университета. Инжиниринг георесурсов. – 2023. – Т. 334. – № 4. – С.135-148. Актуальность. На территории Западной Сибири сосредоточены огромные запасы как пресных вод, так и углеводородов, добыча и разработка которых увеличивается с каждым годом. Нефть является одним из главных факторов экологического риска для природных экосистем Севера. Среди компонентов нефти выделяются полициклические ароматические углеводороды, обладающие...

The content and composition of 19 priority polycyclic aromatic hydrocarbons (PAHs) in peat oligotrophic soils (Cryic Histosols) in the northern territories of Western Siberia were analyzed by gas chromatography in chloroform extracts. The content of PAHs in the examined soils varies from 33 to 148 ng/g. Low molecular weight (three-ring) PAHs account for 70–75% of the PAHs composition, while the total share of high molecular weight compounds does not exceed 25%. The latter are mainly represented by four-ring species, their concentrations decreasing in the sequence: fluoranthene > pyrene > chrysene. Cluster analysis (Euclidean index and pair group method) demonstrates the correlation of PAH composition with residual eutrophication and manifestation of soil degradation signs. Principal component analysis shows that phenanthrene, pyrene, and, to a lesser degree, fluoranthene and anthracene display the strongest positive correlation with the first component. The second component correlates with the contents of fluoranthene, fluorene, and naphthalene. The degradation of soil oligotrophic peat horizons accompanied by the appearance of mucky material appears as a decrease in the share of fluoranthene and an increase in the concentration of naphthalene. In oligotrophic peat horizons with the signs of residual eutrophication, the share of fluorene and naphthalene increases along with a decrease in the content of phenanthrene and fluoranthene. The diagnostic ratios identified by principal component analysis—Ant/(Ant + Phe) and Flt/Pyr—suggest a natural (petrogenic) origin of the PAHs in all examined peat soils.

The contents of 19 priority polycyclic aromatic hydrocarbons (PAHs) have been studied in soils (Spolic Technosols) and parent rocks of dumps at the Gorlovskoe anthracite deposit (Novosibirsk region). The bulk content of polyarenes in the analyzed soils is highly variable: from 100 to 74 622 ng/g. The absence of statistically significant relationships between PAH concentrations and the contents of carbon and physical clay (<0.01 mm) in the studied soils points to the specific processes of PAH formation upon coal transformation in soil-forming dump deposits. These processes produce bitumen lakes on the surface of dumps, in which the concentration of polyarenes may reach 864.4 mg/g. Cluster analysis with the use of the Jaccard similarity index and single-linkage clustering permitted us to group the studied objects according to the organic matter characteristics; the groups with chemogenic transformation of coal particles were distinguished by the Ward’s method. The principal component analysis proved that phenanthrene and 5–6-nucleus compounds have the closest correlation with the first component, whereas the second component correlates reliably with fluoranthene, naphthalene, anthracene, and pyrene. According to our results, the Phe/(Phe + Chr) ratio appears to be the most promising index for evaluating chemical transformation of coal in soils of anthracite deposits.