The age of the sediment core was determined by using the 210 Pb isotope dating method,and the content of polybrominated diphenyl ethers ( PBDEs) was analyzed by using GC-MS.The ecological risk assessment of the sampling points was conducted by using the risk entropy method.The results indicated that commercial Deca-BDE,Octa-BDE,Penta-BDE products,and debromination of higher degree bromo-diphenyl ether compounds may serve as sources for polybrominated diphenyl ethers in the Huaihe River.The prevalence of BDE-47 in the sediment cores can be attributed to widespread usage of Bromkal 70-5 diphenyl ether (Bromkal 70-5DE) and Bramkal DE-71 in this region.Reduction debromination within the sediments resulted in a higher occurrence of BDE-28.Since the 1980s,extensive commercial use of poly-brominated diphenyl ethers has led to a significant increase in their concentration across all three sampling areas.Most time periods exhibited a low ecological risk with a risk entropy value below 0.01.
维普
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