Bioturbation-Driven Release of Buried PCBs and PBDEs from Different Depths in Contaminated Sediments
Bioturbation-Driven Release of Buried PCBs and PBDEs from Different Depths in Contaminated Sediments
复制标题
DOI：
10.1021/es100615g
复制
发表时间：
2010-10-01
影响因子：
11.4
通讯作者：
Wiberg, Karin
中科院分区：
文献类型：
--
作者：
Josefsson, Sarah;Leonardsson, Kjell;Wiberg, Karin
生物扰动可以重新动员以前埋在地下的污染物，导致水生生物群暴露的增加。在实验室条件下研究了埋藏的多氯联苯和多溴二苯醚在3个不同沉积物深度(2.0~2.5 cm、5.0~5.5 cm和10.0~10.5 cm)中的迁移行为。多氯联苯和多溴二苯醚在马伦策尔氏菌的存在下的再动员作用显著更高。而不是在处理和对照(没有大型动物)中。最浅层(2.0-2.5 cm>；5.0-5.5 cm>；10.0-10.5 cm)的迁移能力最强，但由于生物扰动作用，污染物被迁移到至少10 cm以下。疏水性较低的同系物的再动员程度高于疏水性较强的同系物。污染物在水体中颗粒物和溶解相之间的分布取决于污染物的疏水性和埋藏深度，来自更深层的同系物向颗粒物相的分布增加。释放通量和沉积物-水的传质系数(MTCs)表明，多毛类马伦策尔氏菌对水体的生物扰动。可导致波罗的海沉积物中埋藏污染物的显著再动员。
Bioturbation can remobilize previously buried contaminants, leading to an increased exposure of aquatic biota. The remobilization of buried polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) from three different sediment depth layers (2.0-2.5 cm, 5.0-5.5 cm, and 10.0-10.5 cm) was studied in a laboratory experiment with two benthic macrofauna species, the amphipod Monoporeia affinis and the polychaete Marenzelleria spp. Remobilization of PCBs and PBDEs was significantly higher in the presence of Marenzelleria spp. than in M. affinis treatments and controls (without macrofauna). The highest remobilization occurred from the most shallow layers (2.0-2.5 cm > 5.0-5.5 cm > 10.0-10.5 cm), but contaminants were remobilized due to bioturbation from layers down to at least 10 cm. Congeners with lower hydrophobicity were remobilized to a higher extent than more hydrophobic congeners. The contaminant distribution between the particulate and the dissolved phase in the water column depended on hydrophobicity and burial depth of the contaminant, with congeners from deeper layers displaying an increased distribution to the particulate phase. Release fluxes and sediment-to-water mass transfer coefficients (MTCs) show that bioturbation by the polychaete Marenzelleria spp. can lead to a significant remobilization of buried contaminants from Baltic Sea sediments.