ESTIMATION OF LEVEL OF SOIL POLLUTION IN IVANOVO CITY BY POLYCYCLIC AROMATIC HYDROCARBONS

The paper presents the results of a study of the level of soil pollution in the city of Ivanovo with polycyclic aromatic hydrocarbons (PAHs). In soil samples, 13 of the 16 PAHs recommended for control by the US EPA were identified. Acetonaphthylene, acetonaphthene and indeno(1,2,3-cd)py-rene were absent from the priority list in the soil cover of the city. The total concentration of PAHs in the soil cover varies from 869 to 23343 mu g/kg, with a median value of 6805 mu g/kg. Analysis of the distribution of PAH concentrations relative to their molecular weight showed that the main contribution to the total content is made by PAHs with a low molecular weight, the contribution of which is about 80%. It was found that the sources of fluorene, chrysene, benzo(a)anthracene, benzo(a)pyrene, and dibenz(a,h)anthracene can be both local and transboundary. It is shown that the average total content of PAHs in the soils of the city is 50 times higher than the background level. Therefore, the main channel of their input is still local emission sources. It was revealed that the contribution of carcinogenic PAHs to their total content does not exceed 12%, with similar to 85% accounted for by benzo(b)fluoranthene, and the proportion of benzo(a)pyrene does not exceed 12.5%. An assessment of the values of individual carcinogenic and non-carcinogenic risks for the city population was carried out, which showed that the found values correspond to a negligible individual risk. The level of risks of carcinogenic effects in the population, which manifests itself when the soil cover is contaminated with PAHs, is commensurate with the magnitude of health risks from soil contamination with heavy metals, and for non-carcinogenic effects it is an order of magnitude lower.