Determination of the Allowable Residual Content of Oil and its Transformation Products in Soils to Ensure Environmental Safety and Land Recultivation During oil Production in the Perm Region

Recommendations for the establishment of standards for the content of petroleum products in the soils of the region have been developed. Experiments have been carried out to determine the permissible residual content of oil and its transformation products in soils for podzolic, predominantly deep podzolic soil, sod-podzolic soil, predominantly shallow and shallow podzolic soil, sod-podzolic illuvial-iron soil, chernozem podzolized soil and floodplain soil. Chronic phytotoxicity was assessed by the reaction of four species of terrestrial plants: soft wheat, cress, hybrid spruce and common pine. An aqueous extract of petroleum contaminated soils was tested using test subjects Chlorella Vulgaris and Daphnia Crustacea. Quantitative indicators of permissible concentration of hydrocarbons in soils after reclamation for agricultural and forest lands in Perm Krai were obtained.