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	Effects of redox potential and pH value on the release of rare earth elements from soil
	Cao, XD; Chen, Y; Wang, XR; Deng, XH
刊名	CHEMOSPHERE
	2001-08-01
卷号	44期号:4页码:655-661
关键词	redox potential pH value rare earth elements soil release
ISSN号	0045-6535
通讯作者	Cao, XD()
英文摘要	Equilibrium release experiments were conducted under three different pH values of 3.5, 5.5 and 7.5 as well as three redox potentials of 400, 0 and -100 My to investigate the influence of redox potential and pH value on the La, Ce, Gd and Y release of from the simulated-REEs-accumulation (SRA) soil. Oxygen and nitrogen were allowed to flow into soil suspension to adjust redox potential to a preset value, and 1 mol/l HCl or 1 mol/l NaOH solutions were added into the soil suspension to keep pH at a preset value. Results indicated that La, Ce, Gd and Y release increased gradually with the decrease of pH value or Eh, and the influence of redox potential on Ce was more remarkable than on La, Gd and Y. At the same time. It was observed that La, Ce, Gd and Y releases were positively correlated with the release of Fe and Mn, indicating that La, Ce, Gd and Y releases might originate from dissolution of Fe-Mn oxyhydroxides under reduction and low pH conditions. Moreover, it was found that alteration of pH value and redox potential might affect the change of La, Ce, Gd and Y species in the soil. The contents of La, Ce, Gd and Y in exchangeable fraction and Fe-Mn oxide fraction in the solid phase from soil suspension separation decreased with the decline of pH value and redox potential. Multiple stepwise regression analysis showed that exchangeable fraction and Fe-Mn oxide fraction predominately contributed to the La, Ce, Gd and Y release. Low pH value and redox potential were more favorable to La, Ce, Gd and Y releases following the change of their species. The La, Ce, Gd and Y contents in exchangeable fraction and Fe-Mn oxide fraction are the main contributors to their release. (C) 2001 Elsevier Science Ltd. All rights reserved.
收录类别	SCI
WOS关键词	SEQUENTIAL EXTRACTION ; CONTAMINATED SOIL ; TRACE-METALS ; BIOAVAILABILITY ; SOLUBILITY ; SPECIATION
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000169996400017
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2559155
专题	南京土壤研究所
通讯作者	Cao, XD
作者单位	1.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, Inst Soil Sci, Nanjing 210009, Peoples R China
推荐引用方式 GB/T 7714	Cao, XD,Chen, Y,Wang, XR,et al. Effects of redox potential and pH value on the release of rare earth elements from soil[J]. CHEMOSPHERE,2001,44(4):655-661.
APA	Cao, XD,Chen, Y,Wang, XR,&Deng, XH.(2001).Effects of redox potential and pH value on the release of rare earth elements from soil.CHEMOSPHERE,44(4),655-661.
MLA	Cao, XD,et al."Effects of redox potential and pH value on the release of rare earth elements from soil".CHEMOSPHERE 44.4(2001):655-661.

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