Sulfate-Reducing Bacteria Mobilize Adsorbed Antimonate by Thioantimonate Formation

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

	Sulfate-Reducing Bacteria Mobilize Adsorbed Antimonate by Thioantimonate Formation
	Ye, Li ; Chen, Haoze ; Jing, Chuanyong
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
	2019-07
卷号	6 期号:7 页码:418-422
ISSN号	2328-8930
英文摘要	The biogeochemical cycling of antimony (Sb) is often coupled with sulfur and sulfate-reducing bacteria (SRB). The biogenic sulfide is usually assumed to facilitate Sb immobilization via Sb2S3 precipitation. Here, on the contrary, we discovered that SRB mobilize adsorbed Sb(V). When Sb-V(OH)(6)(-)-bearing goethite was incubated anaerobically with Desulfovibrio vulgaris DP4, an elevated level of antimony was released due to the formation of thioantimonate, which is the dominant Sb species in solution. Our Fourier transform ion cyclotron resonance mass spectrometry analysis revealed multiple six- or five-coordinate thioantimonate intermediates, suggesting stepwise ligand exchange of hydroxyl groups on Sb-V(OH)(6)(-) by biogenic sulfide. Direct H2S elimination reactions resulted in four-coordinate thioantimonate species as the stable end product, which was confirmed by our density functional theory calculations. The thiolation of antimonate is pH-dependent and occurs in neutral environments. The thiolation changed Sb(V) from a six-coordinate octahedral coordination to a four-coordinate tetrahedral coordination, weakening its affinity for iron oxides and thus facilitating its release into the aquatic environment. The results of this study highlight the importance of biogenic sulfide produced by SRB for the fate and transport of Sb.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43026]
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
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ye, Li,Chen, Haoze,Jing, Chuanyong. Sulfate-Reducing Bacteria Mobilize Adsorbed Antimonate by Thioantimonate Formation[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS,2019,6(7):418-422.
APA	Ye, Li,Chen, Haoze,&Jing, Chuanyong.(2019).Sulfate-Reducing Bacteria Mobilize Adsorbed Antimonate by Thioantimonate Formation.ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS,6(7),418-422.
MLA	Ye, Li,et al."Sulfate-Reducing Bacteria Mobilize Adsorbed Antimonate by Thioantimonate Formation".ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS 6.7(2019):418-422.