纳米Fe<sub>3</sub>O<sub>4</sub>覆盖对沉积物-水界面砷释放的影响

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Abstract In order to reveal the passivation effect of nano-iron tetroxide (nFe₃O₄) covering on soluble arsenic (As) and labile As in sediments, on the basis of laboratory culture experiments, micro-interface analysis technology, high-resolution equilibrium gap Water harvesting technology (HR-peeper) and Diffusive Gradients in Thin-films technology (DGT) were used to explore the mechanism of action of As in the redox environment, iron and manganese content of sediments covered by nFe₃O₄. The results showed that the pH value of the sediment under the coverage of nFe₃O₄ gradually increased compared with the control group, and the Eh first decreased and then increased; nFe₃O₄ could effectively remove dissolved As from sediments, the maximum effective removal rate was 22%; the average value of available As was reduced by 2.30μg/L by the coverage of nFe₃O₄; There was a significant positive correlation between solube As, solube Fe(II) and solube Mn (P<0.001). Similarly, there was also a significant positive correlation between labile As, labile Fe(II) and labile Mn. (P<0.001); the coverage of nFe₃O₄ could promote the increase of the content of amorphous Fe and Al oxides bound.

Key words： nano ferric oxide soluble As labile-As arsenic form sediment

Received: 23 May 2022

PACS:

X524

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	Articles by authors
	YAN Yu-lin
	YAN Wen-ming
	QIAN Bao
	CHEN Xiang
	HE Xiang-yu
	XIAO Xiao
	WU Ting-feng

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YAN Yu-lin,YAN Wen-ming,QIAN Bao等. Effect of nFe₃O₄ capping on arsenic release at sediment-water interface[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5836-5844.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5836

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