Migration forms of hydrocarbons in waters and bottom sediments of the Gulf of Riga

It is found that hydrocarbons are constantly accumulated on the main geochemical barriers: water-atmosphere, river-sea, water-suspended matter, and water-bottom sediment interfaces. Degree of hydrocarbon accumulation reaches 13.5-17.6 in the surface microlayer and exceeds 1000 in bottom sediments. Hydrocarbon composition changes in this process. Local pollutant loads result in accumulation of polycyclic aromatic hydrocarbons by bottom sediments and benzo(a)pyrene concentration sometimes exceeds MPC. Content of hydrocarbon migratory forms is calculated.

研究表明，烃类持续在四类主要地球化学障界面富集：水-气界面、河-海界面、水-悬浮物界面以及水-底沉积物界面。表层微层中的烃类富集程度可达13.5~17.6，而底沉积物中的富集程度则超过1000。在此富集过程中，烃类组成会发生相应演化。局部污染物负荷会促使底沉积物富集多环芳烃（polycyclic aromatic hydrocarbons），且苯并(a)芘（benzo(a)pyrene）浓度有时会超出MPC限值。研究人员已对烃类迁移态的含量进行了测算。