淡水沉积物中的游离态和结合态多溴二苯醚及四溴双酚 A。
Free and bound polybrominated diphenyl ethers and tetrabromobisphenol A in freshwater sediments.
机构信息
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
出版信息
Mar Pollut Bull. 2010 May;60(5):718-24. doi: 10.1016/j.marpolbul.2009.11.023. Epub 2009 Dec 29.
Both free and bound fractions of polybrominated diphenyl ethers (PBDEs) and tetrabromobisphenol A (TBBPA) in sediment were examined. The free fraction was operationally defined as the fraction of each target compound extracted with a solvent mixture of hexane/acetone by Soxhlet extraction, while the bound fraction was the portion released from the sediments by alkaline hydrolysis following the solvent extractions. Tri- to hepta-BDEs and TBBPA were detected in the bound fraction. Bound PBDEs accounted for 0.2-2.8% of the total PBDEs and bound TBBPA accounted for 6.5-48% of the total TBBPA, in surface sediments. In sediment cores, these percentages ranged from 1.8% to 42% for bound PBDEs and 22-92% for bound TBBPA. The percentages of bound materials showed an increasing trend with the sediment depth. Sequestration of PBDEs and TBBPA within sediments might be an important geochemical fate of these brominated flame retardants.
研究了沉积物中多溴二苯醚（PBDEs）和四溴双酚 A（TBBPA）的游离态和结合态。游离态是指用正己烷/丙酮溶剂混合物通过索氏提取萃取得到的目标化合物的部分，而结合态是通过溶剂提取后碱性水解从沉积物中释放的部分。在结合态中检测到了三溴至七溴代二苯醚和 TBBPA。在表层沉积物中，结合态 PBDEs 占总 PBDEs 的 0.2-2.8%，结合态 TBBPA 占总 TBBPA 的 6.5-48%。在沉积物芯中，结合态 PBDEs 的比例范围为 1.8%-42%，结合态 TBBPA 的比例范围为 22%-92%。结合态物质的比例随沉积物深度的增加而呈上升趋势。PBDEs 和 TBBPA 在沉积物中的固定可能是这些溴系阻燃剂的一个重要的地球化学归宿。
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