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Effects of nFe 3 O 4 capping on phosphorus release from sediments in a eutrophic lake

This study applied the techniques of high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) to explore the effects and the behind mechanism for inhibition phosphorus (P) releasing from sediments by nFe O capping. The highest decreasing rates of SRP and labile P (i.e., 49% a...

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Bibliographic Details
Published in:Environmental science and pollution research international 2021-04
Main Authors: Chen, Xiang, Liu, Ling, Yan, Wenming, Li, Minjuan, Xing, Xiaolei, Li, Qi, Zhu, Liangzhen, Wu, Tingfeng, He, Xiangyu
Format: Article
Language:English
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Summary:This study applied the techniques of high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) to explore the effects and the behind mechanism for inhibition phosphorus (P) releasing from sediments by nFe O capping. The highest decreasing rates of SRP and labile P (i.e., 49% and 47%, respectively) and the decreased flux of SRP showed that nFe O capping can successfully control sediment internal P release. Adsorption by Fe(III) hydroxides with the oxidation of Fe(II) was one of the reasons for the decrease of P concentrations in nFe O capping sediments. This was supported by the increase of Eh and significant negative correlation between Eh with Fe(II) (soluble and labile Fe(II)) and P (SRP and labile P) and significant positive correlation between Fe(II) and P in sediments by nFe O capping. An outer-sphere complex between positively charged nFe O surface groups and P formation was the other reason to decrease the concentrations of P in the nFe O capping sediments. This was supported by the decrease of pH value in sediments by the capping of nFe O . This study shows that nFe O , when used as capping agent, can effectively control the sediment internal P release, which is expected to be used as a potential material for repairing lake eutrophication.
ISSN:1614-7499