Predicting the bioavailability of sediment-associated polybrominated diphenyl ethers using a 45-d sequential Tenax extraction
Predicting the bioavailability of sediment-associated polybrominated diphenyl ethers using a 45-d sequential Tenax extraction
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使用 45 天连续 Tenax 萃取预测沉积物相关多溴二苯醚的生物利用度
DOI：
10.1016/j.chemosphere.2011.07.069
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发表时间：
2011-10-01
期刊：
影响因子：
8.8
通讯作者：
Zhu, Lingyan
中科院分区：
文献类型：
--
作者：
Liu, Man;Tian, Shengyan;Zhu, Lingyan
采用45 d Tenax萃取法评价了三种加钉沉积物中多溴联苯醚（PBDEs）的生物利用度。通过对其中一种沉积物在室温下孵育7、14、30和60 d，研究了老化对多溴二苯醚解吸动力学的影响。解吸动力学用三室模型很好地描述了。极慢解吸组分（F(vs)）贡献了沉积物中大部分的解吸多溴二苯醚。多溴二苯醚的总解吸量随着沉积物中总有机碳的增加而减少，表明有机质是控制沉积物中多溴二苯醚分配的重要因素。多溴二苯醚的总解吸量减少，而log [(F(slow) + F(vs))/F(rap)]随多溴二苯醚同系物的log K（low）而增加，表明沉积物中多溴二苯醚的生物利用度随同系物的log K（low）而降低。随着PBDE在沉积物中的停留时间从7 d增加到60 d，各PBDE同系物的F（rap）随F（vs）的增加而逐渐减小。F（rap）与F(6)/F（24）之间存在良好的正相关关系，说明6 h或24 h Tenax提取均可作为F（rap）和生物利用度的指标。总的来说，本研究结果表明，壬二苯醚和十溴二苯醚在沉积物中的生物利用度很低，因为它们具有很强的疏水性和较大的分子尺寸。(C) 2011 Elsevier Ltd.版权所有。
A 45-d Tenax extraction was used to evaluate the bioavailability of polybrominated diphenyl ethers (PBDEs) in three spiked sediments. The effect of aging on desorption kinetics of PBDEs was investigated by incubating one of the sediments for 7, 14,30 and 60 d at room temperature. Desorption kinetics were well described by a three-compartment model. The fraction of very slow desorption (F(vs)) contributed the most of the desorbed PBDEs from sediments. The total desorption amount of PBDEs decreased with the increase of total organic carbon in the sediments, suggesting that organic matter is an important factor controlling the partition of PBDEs in sediments. The total desorption amount of PBDEs decreased while log [(F(slow) + F(vs))/F(rap)] increased with log K(ow) of PBDE congeners, indicating that the bioavailability of PBDEs in sediment decreases with log K(ow) of the congeners. As the residential time of PBDEs in the sediment increased from 7 to 60 d, F(rap) of individual PBDE congeners decreased gradually with simultaneous increase of F(vs). There was a good positive correlation between F(rap) and F(6)/F(24), indicating that either 6 h or 24 h Tenax extraction could be a proxy for F(rap) and bioavailability. In general, the results in present study suggest that the bioavailability of nona- and deca-BDEs in sediment is very low due to their strong hydrophobicity and large molecular size. (C) 2011 Elsevier Ltd. All rights reserved.