The fate of arsenic adsorbed on iron oxides in the presence of 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

	The fate of arsenic adsorbed on iron oxides in the presence of arsenite-oxidizing bacteria
	Zhang, Zhennan; Yin, Naiyi; Du, Huili; Cai, Xiaolin; Cui, Yanshan
刊名	CHEMOSPHERE
	2016-05
卷号	151 期号:0 页码:108-115
关键词	Arsenic Iron oxide Arsenite-oxidizing bacteria
英文摘要	Arsenic (As) is a redox-active metalloid whose toxicity and mobility in soil depend on its oxidation state. Arsenite [As(III)] can be oxidized by microbes and adsorbed by minerals in the soil. However, the combined effects of these abiotic and biotic processes are not well understood. In this study, the fate of arsenic in the presence of an isolated As(III)-oxidizing bacterium (Pseudomonas sp. HN-1, 10(9) colony forming units (CFUs).ml(-1)) and three iron oxides (goethite, hematite, and magnetite at 1.6 g L-1) was determined using batch experiments. The total As adsorption by iron oxides was lower with bacteria present and was higher with iron oxides alone. The total As adsorption decreased by 78.6%, 36.0% and 79.7% for goethite, hematite and magnetite, respectively, due to the presence of bacteria. As(III) adsorbed on iron oxides could also be oxidized by Pseudomonas sp. HN-1, but the oxidation rate (1.3 mu mol h(-1)) was much slower than the rate in the aqueous phase (96.2 mu mol h(-1)). Therefore, the results of other studies with minerals only might overestimate the adsorptive capacity of solids in natural systems; the presence of minerals might hinder As(III) oxidation by microbes. Under aerobic conditions, in the presence of iron oxides and As(III)-oxidizing bacteria, arsenic is adsorbed onto iron oxides within the adsorption capacity, and As(V) is the primary form in the solid and aqueous phases. (C) 2016 Elsevier Ltd. All rights reserved.
收录类别	SCI
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/35959]
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	Zhang, Zhennan,Yin, Naiyi,Du, Huili,et al. The fate of arsenic adsorbed on iron oxides in the presence of arsenite-oxidizing bacteria[J]. CHEMOSPHERE,2016,151(0):108-115.
APA	Zhang, Zhennan,Yin, Naiyi,Du, Huili,Cai, Xiaolin,&Cui, Yanshan.(2016).The fate of arsenic adsorbed on iron oxides in the presence of arsenite-oxidizing bacteria.CHEMOSPHERE,151(0),108-115.
MLA	Zhang, Zhennan,et al."The fate of arsenic adsorbed on iron oxides in the presence of arsenite-oxidizing bacteria".CHEMOSPHERE 151.0(2016):108-115.