POLYBROMINATED DIPHENYL ETHERS AND PERFLUORINATED COMPOUNDS IN DETROIT RIVER SEDIMENT
The Detroit River is one of the connecting rivers between Lake Huron and Lake Erie. Its watershed is highly urbanized and industrialized and the resultant pollution contributes to its designation as a binational Area of Concern (AOC). Archived sediment samples taken from several Environment Canada monitoring programs established the occurrence and spatial distribution of polybrominated diphenyl ethers (PBDEs) and perfluorinated compounds (PFCs) on sediment in the Detroit River. Levels of both of these new and emerging chemicals were relatively low compared to historic concentrations of polychlorinated biphenyls (PCBs). Of the PFCs only perfluorooctanesulfonic acid (PFOS) was detected consistently. Background concentrations of 1 ng/g were determined upstream in Lake St. Clair and Lake Huron. Levels increased from urban sources at the top of the river to 15 ng/g but levels decreased as it progressed down the river to background levels entering Lake Erie. There appeared to be little influence on the concentrations from the tributaries. Turkey Creek, the second highest concentration from all of the Canadian tributaries, measured a concentration of only 1.1 ng/g. PFOS was voluntarily pulled from production in 2000 and while there is considerable variation in the data, decreases from 2000 to 2006 are not apparent from this study. In contrast PBDEs showed an opposite trend with increasing levels down the river. Background levels of about 10 ng/g were measured upstream at the head of the river as well as in Lakes Huron and St. Clair. Levels increased stepwise down the river and reached a maximum concentration of 108 ng/g. While some PBDEs are still in production several formulations have been banned, and there is no evidence that environmental levels have decreased in the Detroit river.
Burniston Debbie A. Marvin Chris H.
Environment Canada,867 Lakeshore Rd. Burlington,Ontario,Canada,L7R 4A6
国际会议
北京
英文
1-5
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）