No abstract

This article presents the characteristic of contamination of natural water from Dnieper River in Kiev region by polychlorinated biphenyls (PCBs) on the results of the investigations, that were carried out during the period between 2011 and 2013 years. Total concentration of PCBs (29 congeners) ranged from 2.8 to 57.2 ng/dm 3. These pollution levels were not high compared with other world's major rivers. Meanwhile, the predominance of congeners with number of chlorine atoms from 4 to 6 was recorded. Its proportion accounted for 74-99 % of total content of PCBs. It was shown that about half of PCBs is associated with suspended particles: 20-31 %-at thin and 22-32 %-at rough fractions. 42-55 % of PCBs are contained in water phase. Disperse-phase distribution of individual congeners depends on number of chlorine atoms in the molecule. The higher this number the lower water-soluble part of congener.

No abstract

It was indicated that dominant part of OCPs is associated with suspended particles: 16-25 %-at thin and 37-52 %-at rough fractions. The dissolved fraction of OCPs is accounted only 24-38 %.

<div><p>This article presents the monitoring results of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs) in surface water of the Dnieper River for the period 2011–2019. Total levels of OCPs, PCBs and PAHs consist of 1,4–17,1; 2,8–57,2; and 7,5–378,6 ng/L, respectively. A significant increase in pollution levels was not identified. Research results of the disperse-phase distribution of these substances in water were also provided. Less than half of the total contents of pollutants were in the water phase. Average water-soluble parts of OCPs, PCBs, and PAHs accounted for 32, 42, and 44 %, respectively. It was shown that water-soluble parts of individual pollutants decrease with the increase in <span style="text-decoration: line-through;">the</span> coefficients of hydrophobicity of compounds. The clearest reliable, relevant correlation between water-soluble parts of individual congeners and coefficients of hydrophobicity was obtained for PCBs.</p></div><p align="center"><strong><br /></strong></p>