Tian Qi-chang, Tang Hong-bo, Xia Dan, Wang Sha-sha, Gao Li-rong
Huan Jing Ke Xue. 2015 Dec;36(12):4479-85.
Polybrominated diphenyl ethers (PBDEs) are highly lipophilic compounds with high toxicity and long-term bioaccumulation, which have strong affinities to suspended particulates in water. So PBDEs are easily adsorbed to sediments, and cause potential risks to human beings and aquatic ecosystem. In order to investigate the levels and patterns of PBDEs in the Yangtze River, 13 surface sediment samples were collected from the middle reaches of the regions and the concentrations of 9 PBDE congeners in the sediments were determined using High Resolution Gas Chromatography/High Resolution Mass Spectrometry (HRGC/HRMS). The total concentrations of PBDEs ranged from 46.1 to 326 pg · g⁻¹ dry weight. BDE-99 and BDE-47 were the dominant PBDE congeners, which averagely contributed 51.6% and 19.6%, respectively. The concentrations of PBDEs were relatively low compared to those in other studies. The total organic carbon (TOC) was also analyzed in this study, and the results indicated that there was no obvious positive correlation between the levels of PBDEs and TOC. In addition, based on the PBDEs concentration levels, the ecotoxicological risks of PBDEs contamination in surface sediments of the Yangtze River were evaluated by the quotient method. The results showed that the levels of PBDEs were considerably low and these compounds should have no risk to human health.
多溴二苯醚（PBDEs）是具有高毒性和长期生物累积性的高度亲脂性化合物，它们与水中的悬浮颗粒物具有很强的亲和力。因此，PBDEs很容易吸附到沉积物上，并对人类和水生生态系统造成潜在风险。为了调查长江中PBDEs的含量水平和分布模式，从该区域中游采集了13个表层沉积物样本，并使用高分辨率气相色谱/高分辨率质谱（HRGC/HRMS）测定了沉积物中9种PBDE同系物的浓度。PBDEs的总浓度范围为46.1至326 pg·g⁻¹干重。BDE-99和BDE-47是主要的PBDE同系物，它们的平均贡献率分别为51.6%和19.6%。与其他研究相比，PBDEs的浓度相对较低。本研究还分析了总有机碳（TOC），结果表明PBDEs含量水平与TOC之间没有明显的正相关关系。此外，基于PBDEs的浓度水平，采用商值法评估了长江表层沉积物中PBDEs污染的生态毒理学风险。结果表明，PBDEs的含量水平相当低，这些化合物对人类健康应该没有风险。
