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Remobilization and bioavailability of polycyclic aromatic hydrocarbons from estuarine sediments under the effects of Nereis diversicolor bioturbation

Author:
Sun, Nan, Chen, Yanli, Xu, Shuqin, Zhang, Ying, Fu, Qiang, Ma, Lixin, Wang, Qi, Chang, Yuqing, Man, Zhe
Source:
Environmental pollution 2018 v.242 pp. 931-937
ISSN:
0269-7491
Subject:
bioavailability, bioturbation, desorption, estuarine sediments, laboratory experimentation, mass transfer, molecular weight, polycyclic aromatic hydrocarbons, sediment transport, sediment-water interface
Abstract:
The effects of Nereis diversicolor bioturbation on the remobilization and bioavailability of polycyclic aromatic hydrocarbons from estuarine sediment were determined after 60 d in a laboratory experiment. The release fluxes and mass transfer coefficients showed that bioturbation by N. diversicolor can lead to a significant remobilization of polycyclic aromatic hydrocarbons (PAHs) from estuarine sediments. Bioturbation enhanced the release of PAHs from sediment to water by accelerating the transport of sediment particles to the sediment-water interface followed by PAHs desorption to the water. The bioavailability of PAHs was described by SPMD-sediment accumulation factors (SSAF). The SSAF of low molecular weight PAHs with bioturbation was significantly higher than that of PAHs without bioturbation, and there were no significant variations in high-molecular-weight PAHs. Our results revealed that N. diversicolor bioturbation significantly increased PAHs release from sediment to water but only increased the bioavailability of low-molecular-weight PAHs.
Agid:
6104984