沉积物中磷含量对沉积物-水界面中铅和镉迁移的影响的实验研究。,Science of the Total Environment

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沉积物中磷含量对沉积物-水界面中铅和镉迁移的影响的实验研究。
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-02-24 , DOI: 10.1016/j.scitotenv.2020.137535
Tingting Shen ₁ , Yuanyuan Tang ₂ , Yong Jie Li ₃ , Yunsong Liu ₂ , Hongwei Hu ₂

Affiliation

河流沉积物中的磷（P）在水体富营养化环境的沉积物-水界面中的重金属的命运和运输中起着重要作用。为了阐明磷的负载效应，本研究采用不同磷含量的沉积物，通过实验研究了Pb2 +和Cd2 +的吸附/解吸以及P在吸附/解吸过程中的释放行为。结果表明，在单个Pb和二元Pb + Cd系统中，Pb2 +离子与含P沉积物之间具有很强的亲和力。在单金属系统中，所有类型的沉积物（15.04-19.44 mg g-1）对Pb2 +的吸附能力均高于Cd2 +（4.68-5.56 mg g-1）。在二元金属系统中，Pb2 +的吸附受到共存的Cd2 +的轻微影响，但是Cd2 +的吸附能力下降了5倍以上。此外，通过增加沉积物中P的含量，可以提高Pb2 +在沉积物上的吸附量和保留能力。同时，沉积物上附着的Pb2 +也密切依赖并显着抑制了P的释放。Pb和Pb + Cd沉积物在解吸过程中的P释放量比原始沉积物（未吸附重金属的沉积物）低50倍以上，但单个Cd的释放量降低了两倍。沉积物。此外，X射线光电子能谱的结果表明了P负载在沉积物和上覆水中Pb迁移中的关键作用。

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An experimental study about the effects of phosphorus loading in river sediment on the transport of lead and cadmium at sediment-water interface.

Phosphorus (P) in the river sediment plays an important role in the fate and transport of heavy metals at sediment-water interface of the aquatic eutrophication environment. To explicate the effect of P loading, the sediments with different P contents were employed in this study to experimentally investigate the adsorption/desorption of Pb2+ and Cd2+ and the releasing behavior of P during the adsorption/desorption processes. Results illustrated a strong affinity between Pb2+ ions and the P-containing sediments in both single Pb and binary Pb + Cd systems. In single-metal systems, the Pb2+ adsorption capacities of all types of sediments (15.04-19.44 mg g-1) were higher than those for Cd2+ (4.68-5.56 mg g-1). While in binary-metal systems, the Pb2+ adsorption was slightly influenced by the coexisting Cd2+, but the Cd2+ adsorption capacities were decreased by over 5 times. Moreover, the adsorption amount and retention ability of Pb2+ on sediment were enhanced by increasing content of P in the sediment. Meanwhile, the releasing of P was also closely depended and significantly inhibited by the Pb2+ attached on the sediment. The P release amounts during the desorption processes of Pb- and Pb + Cd-loaded sediments were over 50 times lower than those from the raw sediments (sediments without heavy metals adsorbed), but the values decreased by a factor of two for the single Cd-loaded sediments. Furthermore, the results of X-ray photoelectron spectroscopy indicated the crucial role of P loading in Pb transport in the sediment and overlaying water. The findings in this study showed important implications for the transport of heavy metals and P at the sediment-water interface and offered new insights for further explicating the mechanisms of secondary pollution caused by heavy metals and P in aquatic eutrophication environment.

更新日期：2020-02-25

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