Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 8, Pages 7170-7179Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-5235-7
Keywords
Polybrominated diphenyl ethers; Surface sediment; Commercial penta-BDEs; Emission source; Risk assessment
Categories
Funding
- National Foundation for Science and Technology Development of Vietnam (NAFOSTED) [104.07-2012.740]
- Atlantic Philanthropies [AP-16657, BMGF-50799]
- Bill & Melinda Gates Foundation
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Concentrations of seven polybrominated diphenyl ethers (PBDEs) congeners were determined in surface sediments collected from several rivers and lakes in Hanoi, the capital city of Vietnam, to understand the status of background contamination, accumulation pattern, sources, and toxic implications for benthic organisms. Total PBDE concentrations in all sediment samples ranged from 0.03 to 17.5 ng/g dry weight (mean 1.33 ng/g dry wt). The most predominant congeners were BDE-47 and BDE-99, which comprised 30 and 25 % of total PBDE concentrations, respectively. Results from statistical analysis indicated that the potential sources of PBDEs of sediments in Hanoi may come from penta-BDE and octa-BDE mixtures. Risk quotients of PBDEs in sediments were also calculated for a benthic species, ranged from 2.12 x 10(-6) - 1.60 x 10(-2), and were markedly lower than threshold value for occurrence of any ecotoxicological risk. This study provides some of the most comprehensive data on the occurrence of PBDEs in sediments from lake and river systems in Vietnam.
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