Levels, Sources and Potential Risks of Polychlorinated Biphenyls and Organochlorine Pesticides in Sediments of Qingduizi Bay, China: Does Developing Mariculture Matter?

Organochlorine pesticides and polychlorinated biphenyls in city drains in Makurdi, central Nigeria: Seasonal variations, source apportionment and risk assessment

“…Reductive dechlorination of higher PCB congeners under anoxic conditions might be another reason for higher levels of lower PCB congeners in the water and sediment from this study. These findings were consistent with other reports [ 78 , 80 ]. Leakages of PCBs from PCB-containing materials such as capacitors and old transformers at various locations in the Makurdi city might enter the open drains through runoff during rains, constituting another important source of PCBs in the studied sites.…”

“…The total, range and mean ± SD of ∑ 7 PCBs in sediment (ngg −1 ) from the open city drains were 37.87,0.60 to 16.55 and 5.41 ± 5.93, respectively during wet season, while the total of 47.07, range of0.90–21.19 with mean ± SD of 6.72 ± 7.27 were obtained during dry season ( Table 5 ). In comparison with similar studies, PCBs values have been reported in the range of this study [ 61 , [76] , [77] , [78] , [79] ].…”

Occurrence of Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls in Fogwater at Urban, Suburban, and Rural Sites in Northeast France between 2015 and 2021

“…Even though their use and production are banned worldwide, they continue to be found at important concentrations in the atmosphere resulting from the deposition released from diesel generators, electric equipment, and vehicle exhaust. It should be common knowledge that some equipment and materials containing PCBs, such as capacitors, vessel paints, double framed glazing windows, etc., are still in use or in stock in some regions [52]. Moreover, in high-density population areas, the high levels of PCBs are not only related to the volatilization process from soil and equipment, but also to the thermal processes that mainly occur during industrial processes, waste incineration, vehicle exhaust, and combustion of organic matter.…”