Distribution, accumulation profile, and risk assessment of polybrominated diphenyl ethers in sediment from lake and river systems in Hanoi Metropolitan Area, Vietnam

• DOI: 10.1007/s11356-015-5235-7
• Publication Date: 2015-08-19T22:13:30Z
• Authors: Pham Thi Ngoc Mai; Nguyen Van Thuong; Trinh Thi Tham; Nguyen Khanh Hoang; Hoang Quoc Anh; Tran Manh Tri; Le Si Hung; Dao Thi Nhung; Vu Duc Nam; Nguyen Thi Minh Hue; Nguyen Thi Anh Huong; Duong Hong Anh; Nguyen Hung Minh; Tu Binh Minh
• Keywords: Geologic Sediments; 04 agricultural and veterinary sciences; Ecotoxicology; Risk Assessment; 6. Clean water; Lakes; Rivers; Vietnam; 13. Climate action; Halogenated Diphenyl Ethers; 0401 agriculture, forestry, and fisheries; Cities; Water Pollutants, Chemical; Environmental Monitoring

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 × 10-6 - 1.60 × 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.