Biotransformation of adsorbed arsenic on iron minerals by coexisting arsenate-reducing and arsenite-oxidizing bacteria

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Biotransformation of adsorbed arsenic on iron minerals by coexisting arsenate-reducing and arsenite-oxidizing bacteria
	Ye, Li; Wang, Liying; Jing, Chuanyong
刊名	ENVIRONMENTAL POLLUTION
	2020-01
卷号	256 页码:1-9
关键词	Arsenic aio gene ars gene Bio-transformation Spectroscopy
ISSN号	0269-7491
英文摘要	Bacteria with arsenate-reducing (ars) and arsenite-oxidizing (aio) genes usually co-exist in aerobic environments, but their contrast impacts on arsenic (As) speciation and mobility remain unclear. To identify which kind of bacteria dominate As speciation under oxic conditions, we studied the biotransformation of adsorbed As on goethite in the co-existence of Pantoea sp. IMH with ars gene and Achromobacter sp. SY8 with aio gene. The incubation results show that SY8 dominated the dissolved As speciation as As(V), even though aio exhibited nearly 5 folds lower transcription levels than ars in IMH. Nevertheless, our XANES results suggest that SY8 showed a negligible effect on solid-bound As speciation whereas IMH reduced adsorbed As(V) to As(III). The change in As speciation on goethite surfaces led to a partial As structural change from bidentate corner-sharing to monodentate corner-sharing as evidenced by our EXFAS analysis. Our Mossbauer spectroscopic results suggest that the incubation with SY8 reduced the degree of crystallinity of goethite, and the reduced crystallinity can be partly compensated by IMH. The changes in As adsorption structure and in goethite crystallinity had a negligible effect on As release. The insights gained from this study improve our understanding of biotransformation of As in aerobic environment. (C) 2019 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44622]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Ye, Li,Wang, Liying,Jing, Chuanyong. Biotransformation of adsorbed arsenic on iron minerals by coexisting arsenate-reducing and arsenite-oxidizing bacteria[J]. ENVIRONMENTAL POLLUTION,2020,256:1-9.
APA	Ye, Li,Wang, Liying,&Jing, Chuanyong.(2020).Biotransformation of adsorbed arsenic on iron minerals by coexisting arsenate-reducing and arsenite-oxidizing bacteria.ENVIRONMENTAL POLLUTION,256,1-9.
MLA	Ye, Li,et al."Biotransformation of adsorbed arsenic on iron minerals by coexisting arsenate-reducing and arsenite-oxidizing bacteria".ENVIRONMENTAL POLLUTION 256(2020):1-9.