Dynamics of ferrihydrite-bound organic carbon during microbial Fe   reduction

doi:10.1016/j.gca.2017.06.017

CORC > 北京大学 > 城市与环境学院

	Dynamics of ferrihydrite-bound organic carbon during microbial Fe reduction
	Adhikari, Dinesh ; Zhao, Qian ; Das, Kamol ; Mejia, Jacqueline ; Huang, Rixiang ; Wang, Xilong ; Poulson, Simon R. ; Tang, Yuanzhi ; Roden, Eric E. ; Yang, Yu
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2017
关键词	Ferrihydrite Organic carbon Microbial reduction Degradation and mineralization Mineral phase DISSIMILATORY IRON REDUCTION FRESH-WATER SEDIMENT HUMIC-ACID SORPTIVE STABILIZATION SURFACE COMPLEXATION CHEMICAL-REDUCTION FOREST SOILS BLACK CARBON MATTER TRANSFORMATION
DOI	10.1016/j.gca.2017.06.017
英文摘要	The dynamics of iron (Fe)-bound organic carbon (OC) during dissimilatory microbial Fe(III) reduction has the potential to play an important role in regulating the biogeochemical cycling of carbon (C) in permanently or transiently anoxic soils and sediments. In this study, we investigated the release and transformation of ferrihydrite (Fh)-bound OC during microbial reduction of Fe by Shewanella putrefaciens strain CN32 under a fixed Fe concentration of 13 mM and varying C/Fe molar ratios. We found that reduction of Fe and reductive release of OC was dependent on the C/Fe molar ratio, with high C/Fe ratio enhancing both reduction of Fe and release of OC. For Fh-OC co-precipitates with C/Fe ratio of 3.7, 54.7% of Fh-bound OC was released to solution phase when 25.1% of Fe was reduced. The presence of OC inhibited the transformation of Fh to more crystalline Fe phases both in the bulk and on the surface. Upon reduction, Fh-bound OC became more concentrated on the surface of Fh-OC co-precipitates, and surface components were enriched with carboxylic functional groups. Reduction increased the lability of Fh-bound OC for Fh-OC co-precipitate with C/Fe ratio of 3.7, and aromatic OC was preferentially retained within the co-precipitates. Our results indicate that microbial reduction altered the quantity and composition of OC released from Fh-OC co-precipitates, depending on the C/Fe ratio and associations between Fe and OC. Assuming higher availability of released OC compared to original Fh-bound OC, reduction of Fh can likely lead to enhanced degradation of OC and result in a shorter residence time for OC in soils and sediments. (C) 2017 Elsevier Ltd. All rights reserved.; University of Nevada-Reno Startup fund; DOE [DE-SC0014275]; USDA [2015-67018-23120]; Georgia Institute of Technology and American Chemical Society Petroleum Research Fund [54143-DNI5]; NSF CAREER Award [CHE-1255387]; National Science Foundation [CHE-1429768]; SCI(E); ARTICLE; 221-233; 212
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471294]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Adhikari, Dinesh,Zhao, Qian,Das, Kamol,et al. Dynamics of ferrihydrite-bound organic carbon during microbial Fe reduction[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2017.
APA	Adhikari, Dinesh.,Zhao, Qian.,Das, Kamol.,Mejia, Jacqueline.,Huang, Rixiang.,...&Yang, Yu.(2017).Dynamics of ferrihydrite-bound organic carbon during microbial Fe reduction.GEOCHIMICA ET COSMOCHIMICA ACTA.
MLA	Adhikari, Dinesh,et al."Dynamics of ferrihydrite-bound organic carbon during microbial Fe reduction".GEOCHIMICA ET COSMOCHIMICA ACTA (2017).