Distribution Characteristics of Polybrominated Diphenyl Ethers in Surface River Sediments from the Cheng-Yu Economic Zone

Nineteen surface river sediments were collected from the Cheng-Yu Economic Zone(CYEZ),and the Polybrominated Diphenyl Ethers(PBDEs) in the sediments were analyzed using GC MS method.The results showed that the concentrations of ΣPBDEs(sum of BDE-1,BDE-15,BDE-17,BDE-28,BDE-47,BDE-66,BDE-71,BDE-85,BDE-99,BDE-100,BDE-126,BDE-138,BDE-153,BDE-154,BDE-166,BDE-181,BDE-183 and BDE-190) and BDE-209 in the sediments ranged from 0.20 to 6.45 ng g and from 0.44 to 6.29 ng g,respectively.The PBDE contamination in the CYEZ was relatively low as compared with other studied areas.The PBDEs in most samples from the CYEZ were dominated by BDE-209,suggesting that a primary source was Deca-BDE technical mixture.Meanwhile,the congener patterns of PBDEs in the sediments from Pengshan Minjiang Bridge and Guandu indicated that the major sources of PBDEs were Penta-BDEs technical mixture for Pengshan Minjiang Bridge and Octa-BDEs technical mixture for Guandu.In addition,some BDE congeners,such as BDE-1,BDE-15,BDE-181,and BDE-190,which were rarely reported in previous works,were frequently detected in these sediments(detectable rate higher than 70%) with relatively high abundance.