Depositional Time Trends and Remobilization of PCBs in Lake Sediments
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- 作者：Bondi Gevao ; John Hamilton-Taylor ; Chris Murdoch ; Kevin C. Jones ; Mike Kelly ; and Brian J. Tabner
- 刊名：Environmental Science & Technology
- 出版年：1997
- 出版时间：November 1997
- 年：1997
- 卷：31
- 期：11
- 页码：3274 - 3280
- 全文大小：171K
- 年卷期：v.31,no.11(November 1997)
- ISSN：1520-5851
文摘
The vertical distribution of PCBs was measured in a datedcore from the profundal sediments of Esthwaite Water,U.K. The resulting historical record of 
PCB depositionagreedwell with published U.K. production data. Ratiosbetweenthe various PCB homolog groups revealed significantcompositional variations with depth. Sedimentsdepositedin the last ~10 years and sediments deposited before PCBproduction began are both relatively enriched in the lesschlorinated homolog groups. When considered withotheravailable data, these enrichments provide evidence forpost-depositional mobility of PCBs favoring the more aqueoussoluble and volatile compounds. The results lendfurthersupport to a growing body of evidence that recyling ofPCBs is occurring between the sediments and overlyingwaters, associated with solubilization and diffusivetransport.
PCB depositionagreedwell with published U.K. production data. Ratiosbetweenthe various PCB homolog groups revealed significantcompositional variations with depth. Sedimentsdepositedin the last ~10 years and sediments deposited before PCBproduction began are both relatively enriched in the lesschlorinated homolog groups. When considered withotheravailable data, these enrichments provide evidence forpost-depositional mobility of PCBs favoring the more aqueoussoluble and volatile compounds. The results lendfurthersupport to a growing body of evidence that recyling ofPCBs is occurring between the sediments and overlyingwaters, associated with solubilization and diffusivetransport.