Time Trends of Polybrominated Diphenyl Ethers in Sediment Cores from the Pearl River Estuary, South China
详细信息 查看全文
- 作者：She-Jun Chen ; Xiao-Jun Luo ; Zhen Lin ; Yong Luo ; Ke-Chang Li ; Xian-Zhi Peng ; Bi-Xian Mai ; Yong Ran ; Eddy Y. Zeng
- 刊名：Environmental Science & Technology
- 出版年：2007
- 出版时间：August 15, 2007
- 年：2007
- 卷：41
- 期：16
- 页码：5595 - 5600
- 全文大小：213K
- 年卷期：v.41,no.16(August 15, 2007)
- ISSN：1520-5851
文摘
The present study provides information on the time trendof PBDEs in three sediment cores from the Pearl River Estuary(PRE), South China, using 210Pb dating technique. The
PBDEs (except for BDE 209) concentrations in all sedimentcores increased gradually from the bottom (mid-1970s)to the middle layer (later 1980s and early 1990s) followedby different temporal trends in different locations to the surfacesediments, reflecting the variations in the consumptionof commercial penta-BDEs mixture in different regions ofthe Pearl River Delta. The BDE 209 concentrations remainedconstant until 1990 and thereafter increased exponentiallyto the present, with doubling times of 2.6 ± 0.5-6.4 ±1.6 years, suggesting the increasing market demands for deca-BDE mixture after 1990 in China. The inventories ofPBDEs and BDE 209 in sediments of the PRE were 56.0and 368.2 ng cm-2, respectively, and the total burden of PBDEsin the PRE were estimated at 8.6 metric tons. The currentPBDEs and BDE 209 fluxes to the PRE were 2.1 and29.7 ng cm-2 yr-1, respectively. The concurrent increaseof BDE 209 fluxes and the annual gross industrial outputvalues of electronics manufacturing revealed that therapid growth of electronics manufacturing in this regionsince the early 1990s was responsible for the sharp rise ofBDE 209 fluxes in the past decade. The PBDE congenercompositions of the cores indicated the various input pathwaysfor PBDEs transport to different locations of the estuary.
PBDEs (except for BDE 209) concentrations in all sedimentcores increased gradually from the bottom (mid-1970s)to the middle layer (later 1980s and early 1990s) followedby different temporal trends in different locations to the surfacesediments, reflecting the variations in the consumptionof commercial penta-BDEs mixture in different regions ofthe Pearl River Delta. The BDE 209 concentrations remainedconstant until 1990 and thereafter increased exponentiallyto the present, with doubling times of 2.6 ± 0.5-6.4 ±1.6 years, suggesting the increasing market demands for deca-BDE mixture after 1990 in China. The inventories ofPBDEs and BDE 209 in sediments of the PRE were 56.0and 368.2 ng cm-2, respectively, and the total burden of PBDEsin the PRE were estimated at 8.6 metric tons. The currentPBDEs and BDE 209 fluxes to the PRE were 2.1 and29.7 ng cm-2 yr-1, respectively. The concurrent increaseof BDE 209 fluxes and the annual gross industrial outputvalues of electronics manufacturing revealed that therapid growth of electronics manufacturing in this regionsince the early 1990s was responsible for the sharp rise ofBDE 209 fluxes in the past decade. The PBDE congenercompositions of the cores indicated the various input pathwaysfor PBDEs transport to different locations of the estuary.