Effect of hydroquinone-induced iron reduction on the stability of Fe(III)-As(V) Co-precipitate and arsenic mobilization

doi:10.1016/j.apgeochem.2018.07.017

	Effect of hydroquinone-induced iron reduction on the stability of Fe(III)-As(V) Co-precipitate and arsenic mobilization
	Yuan, Zidan; Ma, Xu; Wu, Xing; Wang, Xin; Wang, Shaofeng; Jia, Yongfeng
刊名	APPLIED GEOCHEMISTRY
	2018-10-01
卷号	97 页码:1-10
关键词	Fe(III)-As(V) co-precipitate Iron reduction Arsenic mobilization Stability
ISSN号	0883-2927
DOI	10.1016/j.apgeochem.2018.07.017
英文摘要	Long-term storage of Fe(III)-As(V) co-precipitate wastes derived from the industrial As removal process poses the risk of secondary arsenic pollution to the local environment. However, its stability in only iron-reducing environment remains unclear. The effect of iron reduction by hydroquinone (QH(2)) on the stability of co-precipitate at Fe/As molar ratio of 5 was investigated in this study. The results showed that 16.5-93% of Fe(III) reduction in NaOH-neutralized co-precipitate caused 0.1-11% (0.1-8.5 mg L-1) As release and 0.9-46% (2.6-130 mg L-1) Fe (II) release at pH 4 and 6. Most of the As(V) and more than half of the Fe(II) generated by the reductive decomposition of Fe(III)-As(V) co-precipitate were retained in solid phases. Solid characterization and thermodynamic calculation indicated that amorphous Fe-3(AsO4)(2) was probably the major secondary mineral for As immobilization. At pH 8, 11-39% As and less than 4% Fe(II) were released into solution after 3.6-87% Fe(III) was reduced to Fe(II). Both amorphous Fe-3(AsO4)(2) and Fe(II, III) (hydr) oxides were responsible for As retention. The solubility of NaOH-neutralized co-precipitates in terms of dissolved As concentration upon Fe(III) reduction at pH 4, 6 and 8 with QH(2)/Fe(III) mol of 1 was lower than that in oxic environment. It was also lower than the solubility of Ca(OH)(2)-neutralized co-precipitate after Fe(III) reduction at pH 4 and 6.
资助项目	National Natural Science Foundation of China[41530643] ; National Natural Science Foundation of China[41673130] ; National Natural Science Foundation of China[41703133] ; National Natural Science Foundation of China[41473111] ; Chinese Academy of Sciences[QYZDJ-SSW-DQC038]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000446455900001
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/123553]
专题	中国科学院沈阳应用生态研究所
通讯作者	Wang, Shaofeng; Jia, Yongfeng
作者单位	Chinese Acad Sci, Key Lab Pollut Ecol & Environm Engn, Inst Appl Ecol, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Yuan, Zidan,Ma, Xu,Wu, Xing,et al. Effect of hydroquinone-induced iron reduction on the stability of Fe(III)-As(V) Co-precipitate and arsenic mobilization[J]. APPLIED GEOCHEMISTRY,2018,97:1-10.
APA	Yuan, Zidan,Ma, Xu,Wu, Xing,Wang, Xin,Wang, Shaofeng,&Jia, Yongfeng.(2018).Effect of hydroquinone-induced iron reduction on the stability of Fe(III)-As(V) Co-precipitate and arsenic mobilization.APPLIED GEOCHEMISTRY,97,1-10.
MLA	Yuan, Zidan,et al."Effect of hydroquinone-induced iron reduction on the stability of Fe(III)-As(V) Co-precipitate and arsenic mobilization".APPLIED GEOCHEMISTRY 97(2018):1-10.