期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 853, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.158522
关键词
Polychlorinated biphenyls; Lake Oxundasj?n; Bioaccumulation; Fish; Sediment; Multimedia modeling
资金
- Vasby municipality
- Sigtuna municipality
This article describes the high levels of PCB contamination in Lake Oxundasjon in Sweden and its impact on the drinking water supply. The authors propose a dynamic mass balance model to identify and quantify the main transport processes of PCBs and predict their long-term turnover under different remediation scenarios.
In 2013, a screening survey including fish (European perch, Perca fluviatilis) from 20 locations in the Stockholm region of Sweden indicated exceptionally high levels of PCBs (> 450 ng sigma PCB7/g ww) in Lake Oxundasjon. An extensive sampling program was launched to define the magnitude and area of impact of PCBs. Moreover, a dynamic mass balance model approach was applied to identify and quantify key transport processes and predict the long-term turnover of PCBs given various remediation scenarios.Based on the dating of sediment profiles, primary emissions of PCBs to Lake Oxundasjon have likely occurred from the end of the 1940s until 1980, reaching the lake via one of its tributaries. Presently, the main source of PCBs is diffusion from the lake sediments. From the lake outlet, > 400 g sigma PCB7/yr are transported to Lake Malaren (the third largest lake in Sweden), supplying drinking water for parts of the Stockholm area. Remediation actions are necessary to reduce the PCB levels in fish below today's marketing limits and environmental quality standards. With natural recovery, our results indicate that the PCB levels in non-migratory fish from Lake Oxundasjon will be elevated for decades to come. The mass of PCBs stored in the lake sediments was estimated, and to our knowledge, Lake Oxundasjon is the most heavily PCB contaminated lake in Sweden. The system constitutes a unique opportunity to test and develop a mathematical mass balance model for PCBs, with substantial data acquired from different aquatic matrices. The model presented in the paper is applicable for risk assessments of PCBs, and the results contribute to the general understanding of the transport and turnover dynamics of PCBs in aquatic ecosystems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据