The effect of microbial sulfidogenesis on the stability of As-Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions

doi:10.1007/s11356-015-5927-z

	The effect of microbial sulfidogenesis on the stability of As-Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions
	Jia, Yongfeng 1; Wang, Shaofeng 1; He, Xin Yu 1,2; Pan, Rongrong 1; Xu, Liying 1; Wang, Xin 1
刊名	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
	2016-04-01
卷号	23 期号:8 页码:7267-7277
关键词	Arsenic-bearing Solid Waste Sulfate Level Arsenic Mobilization Microbial Reduction Of As Fe And s
ISSN号	0944-1344
DOI	10.1007/s11356-015-5927-z
英文摘要	The effect of microbial sulfidogenesis on As transformation and mobilization in solid phase with low Fe/As ratio is still not well known. In this study, microbial transformation and mobilization of As in the As-Fe coprecipitate with different sulfate levels were investigated using chemical extraction and K-edge XANES of As and S. Results showed that approximately 2.7, 24.4, and 83.7 % of total As were released into the aqueous phase in the low-, mid-, and high-sulfate treatments, respectively, indicating that the presence of large amounts of sulfate could enhance microbial arsenic mobilization in the As-Fe coprecipitate. In the low-sulfate treatment, As mobilization was primarily attributed to the reductive dissolution of the Fe (oxy)hydroxides and the As reduction and desorption. In the mid- and high-sulfate treatments, the reduction of arsenate and ferric iron was significantly enhanced. Complete ferric iron reduction was observed in the solid phase, implying that Fe (oxy)hydroxide was transformed to secondary minerals and may be the one of the primary causes for the enhanced As mobilization. Thermodynamic calculations predicted the formation of thioarsenite species after 35 days of incubation based on the concentration of dissolved As(III) and S(-II). Since thioarsenic species is more mobile, its formation may be one of the most important factors enhancing the As release in the high-sulfate system. The result of this study is of significance to completely predict the environmental behavior of As associated with Fe (hydr)oxides in the presence of microbial sulfidogenesis under anoxic conditions.
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000374994600023
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/122606]
专题	中国科学院沈阳应用生态研究所
通讯作者	Wang, Shaofeng
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, Shenyang 110016, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Jia, Yongfeng,Wang, Shaofeng,He, Xin Yu,et al. The effect of microbial sulfidogenesis on the stability of As-Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2016,23(8):7267-7277.
APA	Jia, Yongfeng,Wang, Shaofeng,He, Xin Yu,Pan, Rongrong,Xu, Liying,&Wang, Xin.(2016).The effect of microbial sulfidogenesis on the stability of As-Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,23(8),7267-7277.
MLA	Jia, Yongfeng,et al."The effect of microbial sulfidogenesis on the stability of As-Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 23.8(2016):7267-7277.