Bioaccumulation kinetics of sediment-associated DE-83 in benthic invertebrates (Nereis succinea, polychaete).
Bioaccumulation kinetics of sediment-associated DE-83 in benthic invertebrates (Nereis succinea, polychaete).
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DOI：
10.1016/j.chemosphere.2011.02.005
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发表时间：
2011-06
期刊：
影响因子：
8.8
通讯作者：
S. Tian;Lingyan Zhu
中科院分区：
文献类型：
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作者：
S. Tian;Lingyan Zhu
将多毛类动物 (Nereis succinea) 暴露于 DE-83 污染的沉积物中，以研究沉积物中九溴二苯醚和十溴二苯醚的生物累积性和生物利用度。 DE-83 中的所有主要同源物均可被沙蚕生物利用。沙蚕对九、十溴二苯醚同系物的吸收系数（Ks）范围为0.18~0.65（d−1），其中BDE-207和-208的值略高于BDE-206和-209。从沙蚕中消除九溴二苯醚和十溴二苯醚同系物的速度非常快。九溴二苯醚和十溴二苯醚同系物在沙蚕体内的估计半衰期为 0.7 天。九溴二苯醚和十溴二苯醚同源物的生物利用度非常低，BDE-206 和-209 的 BSAF 为 0.017，BDE-207 和 -208 的 BSAF 为 0.054。这可能是由于 PBDE 的分子尺寸较大且与沉积物颗粒的亲和力较高。随着暴露时间的延长，BDE-206 在沙蚕组织中九溴二苯醚谱中的贡献逐渐减少，而 BDE-207 和 -208 的贡献则增加，这可能是 BDE-209 生物转化为 BDE-207 和 -208 的结果。
Polychaetes (Nereis succinea) were exposed to DE-83 contaminated sediments to investigate the bioaccumulation and bioavailability of nona- and deca-BDEs in sediment. All the major congeners in DE-83 were bioavailable to the lugworms. The uptake coefficients (Ks) of nona- and deca-BDE congeners in lugworms were in the range of 0.18–0.65 (d−1), with the values of BDE-207 and -208 slightly higher than those of BDE-206 and -209. Elimination of nona- and deca-BDE congeners from lugworms was very fast. The estimated half-lives of nona- and deca-BDE congeners in the lugworms were at 0.7d. The bioavailability of nona- and deca-BDE congeners was very low, with BSAF of 0.017 for BDE-206 and -209 and 0.054 for BDE-207 and -208. These may be due to the large molecular size and high affinity of PBDEs to sediment particles. The contribution of BDE-206 in the profile of nona-BDEs in lugworm tissue decreased with exposure time while those of BDE-207 and -208 increased, which could be the result of the biotransformation of BDE-209 to BDE-207 and -208.