Geochemical Barriers on Marginal Filter of the Severnaya Dvina River

The processes of phase transitions of polycyclic aromatic hydrocarbons (PAHs) at geochemical barriers in the components of the aquatic system of the marginal filter of the Severnaya Dvina River are studied based on experimental data. The analysis of the behavior of the most common PAHs in the region is carried out. The PAHs can be considered as reliable indicators of the formation and interaction of components of the aquatic system within the marginal filter, taking into account the development of anthropogenic processes. A phe nomenological model of migration and formation of associations of the most persistent compounds in the range of geochemical barriers is developed. The predominant possibility of migration of PAHs on the suspended material, including biota, is shown. The specificity of the chemical structures of the PAHs determines the characteristics of the transition of PAHs in different zones of the marginal filter in the interaction in systems “snow–ice”, “ice–water”, “water–suspensions”, “water–bottom sediments”. The relationship between important physical and chemical properties of PAHs as factors of their migration activity and real distributions of activity of migration and transformation of complexes of PAHs in different zones of the marginal filter is evaluated. Active and passive PAHs from the point of view of their migration and accumulation in the components of aquatic systems are identified. The classification of PAHs according to the conditions of their migration through barriers taking into account their physicochemical properties is carried out.

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