Abstract
The permissible content of oil and petroleum products in the soil must have a reasonable regional standard. It should be based on presence of specific and non-specific organic compounds in each specific soil, as well as the natural conditions that cause the ability of the soil to self-cleaning, and its provincial characteristics. The value of concentrations of petroleum products in the soil at a biologically safe level has not been established now. It is impossible to justify the maximum permissible concentration of petroleum products in the soil, since they include compounds that are a necessary component of any soil. We calculated the accumulation coefficient for 106 oil fields in 15 geographical regions of the Russian Federation. The accumulation coefficient varies in a narrow range of 1.19-1.21. It is necessary to compare the results of analysis of contaminated soil with the soil before pollution or with the background to establish the fact of a decrease in soil fertility in pollution. We believe it mandatory to consider the background concentration of petroleum products, which is understood as non-specific organic compounds of soils. The question of rationing of petroleum products in the soil remains open to the present time.
Highlights
Natural objective reasons such as the polyfunction and heterogeneity of soils, the variety of chemical forms of pollutants, the ability of soils to self-repair and selfpurification significantly complicate the objective assessment of the content of oil and petroleum products in soils
Oxidation of organic carbon to carbon dioxide – CO2 is the basis of the method for determination of soil organic carbon by I
The calculation of the contain humus fraction is performed by multiplying of the obtained indicator by a coefficient of 1.724, which was introduced in 1864 on the basis of available data on the content of 58% organic carbon in humic acid [4]
Summary
Natural objective reasons such as the polyfunction and heterogeneity of soils, the variety of chemical forms of pollutants, the ability of soils to self-repair and selfpurification significantly complicate the objective assessment of the content of oil and petroleum products in soils. The absence of standards, different quality composition of petroleum products, and provincial features of the soil cover make the study of regularities in assessing the content of petroleum products in soils relevant. The work is aimed to increase the objectivity of the assessment of the content of petroleum products in soils. Sampling and preparation of soils for analysis was carried out in accordance with the Russian State Standard 17.4.4.02-84. A spectrophotometric termination and a fluorescent photometric analysis with "Fluorate 02-3M LUMEX" were used. The concentration of oil products (OP) was determined in n-hexane extract of soil samples
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