Environmental monitoring was conducted in Orenburg Region, specifically in areas characterized by intensive oil production and a significant number of unauthorized temporary oil sludge storage sites, including Perevolotsky, Krasnogvardeysky, Pervomaysky, and Sakmarsky districts. The authors analyzed the content of heavy metals (cobalt, nickel, manganese and chromium), which are part of oil sludge, in soil samples and wheat grains collected at distances of 100 and 2000 m from the boundaries of these temporary storage sites. The obtained concentrations of the studied trace elements did not exceed the maximum permissible concentration. A comparative analysis of the concentrations of heavy metals in agricultural soil and wheat grain was conducted, comparing these levels to their respective background values. Significant differences in the concentrations of heavy metals in the analyzed soil and wheat samples relative to background values were identified. The levels of the trace elements in the sludge-contaminated soil near temporary oil sludge storage sites in the settlements of Pervomaisky, Arkhipovka, and Kinzelka were found to be 1.2 to 2.2 times higher than the background values. The analysis of trace element concentrations in wheat grain revealed that all samples from areas near oil sludge storage sites exhibited higher concentrations compared to those from other locations. Correlation analysis indicated both direct and inverse relationships between the concentrations of trace elements in soil and grain, demonstrating the effectiveness of the sampling methodology and illustrating the migration of the investigated trace elements into wheat grain.
environmental monitoring, oil sludge storage, trace element concentrations in soil, trace element concentrations in wheat.
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