Authors: Xiaoyan Zhang Yaoguo Wu Sihai Hu Cong Lu Chengjun Zhang
Publish Date: 2015/04/14
Volume: 22, Issue: 15, Pages: 11955-11965
Abstract
Soil/sediment organic matter SOM releasing with inherent dissolved organic matter DOM formed in solution was confirmed both in rhizosphere sediment S and uncultivated sediment P water systems and correlations between SOM characteristics subject to sediment’s humification degree and its releasing effects on phenanthrene sorption were emphasized The sequential SOM releasing evidenced by fluorescence and 1HNMR profiles coupled with aqueous DOM solubilization was found to make sorption kinetics atypical and sorption capacity reduced by comparing sorption results among sediments of different pretreatments More importantly the tested S was proved less humified with inherent DOM rich in microbial sources than P and DOM affinity to phenanthrene was thus weakened K doc values of 202–363 × 104 L kg−1 while the inhibitive effects of SOM releasing on sorption were strengthened ascribing to the enlarged alterations of sediment characters and particularly the amplified solubilization effects resulted from the larger proportion of soluble SOM and lower critical micelle concentration 566 mg L−1 of DOM Moreover relative contribution of DOM solubilization to the releasing effects enhanced from 067 for P to 078 for S relative to alterations of sediment characters Consequently mobility and exposure risk of polycyclic aromatic hydrocarbons would be enhanced in a plantsoil/sedimentwater systemThe project was financially supported by the National Natural Science Foundation of China Grant No 40872164 NPU Foundation for Fundamental Research Grant No JCY20130145 China geological survey project No 12120114056201 the Land and Resources Scientific Research of China from special fund in the public interest Grant No 20111020 and graduate starting seed fund of Northwestern Polytechnical University Grant No Z2013158
Keywords: