DOI: 10.1016/j.watres.2018.11.088
Scopus记录号: 2-s2.0-85059045807
论文题名: Using stable isotope fractionation factors to identify Cr(VI) reduction pathways: Metal-mineral-microbe interactions
作者: Zhang Q. ; Amor K. ; Galer S.J.G. ; Thompson I. ; Porcelli D.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 98
结束页码: 109
语种: 英语
英文关键词: Bacterial reduction
; Biogeochemistry
; Chromium
; Isotope fractionation
; Metal-mineral-microbe interaction
Scopus关键词: Bacteria
; Biogeochemistry
; Chromium
; Hematite
; Isotopes
; Metals
; Oxide minerals
; Rare earths
; Bacterial reduction
; Extracellular electron transfer
; Isotope fractionation
; Isotopic fractionation factors
; Membrane-bound enzymes
; Pseudomonas fluorescens
; Shewanella oneidensis MR-1
; Stable isotope fractionations
; Chromium compounds
; chromium
; ferric hydroxide
; ferric oxide
; iron oxide
; membrane enzyme
; metal
; mineral
; stable isotope
; antimicrobial activity
; aqueous solution
; bacterium
; biogeochemistry
; chromium
; goethite
; hematite
; inhibition
; ion exchange
; iron
; isotopic fractionation
; metal
; mineral
; physicochemical property
; reduction
; stable isotope
; survival
; anaerobic growth
; Article
; chemical interaction
; controlled study
; electron transport
; fractionation
; microbial community
; microorganism
; nonhuman
; optical density
; priority journal
; Pseudomonas fluorescens
; reduction (chemistry)
; scanning electron microscopy
; Shewanella oneidensis
; surface property
; Bacteria (microorganisms)
; Pseudomonas
; Pseudomonas fluorescens
; Shewanella
; Shewanella oneidensis MR-1
英文摘要: Microbes interact with metals and minerals in the environment altering their physical and chemical states, whilst in turn metals and minerals impact on microbial growth, activity and survival. The interactions between bacteria and dissolved chromium in the presence of iron minerals, and their impact on Cr isotope variations, were investigated. Cr(VI) reduction experiments were conducted with two bacteria, Pseudomonas fluorescens LB 300 and Shewanella oneidensis MR-1, in the presence of two iron oxide minerals, goethite and hematite. Both minerals were found to inhibit the rates of Cr(VI) reduction by Pseudomonas, but accelerated those of Shewanella. The Cr isotopic fractionation factors generated by Shewanella were independent of the presence of the minerals (ε = −2.3‰). For Pseudomonas, the ε value was the same in both the presence and absence of goethite (−3.3‰); although, it was much higher (ε = −4.3‰) in the presence of hematite. The presence of aqueous Fe(III) in solution had no detectable impact on either bacterial Cr reduction rates nor isotopic fractionation factors. The presence of aqueous Fe(II) induced rapid abiotic reduction of Cr(VI). The different effects that the presence of Fe minerals had on the Cr fractionation factors and reduction rates of the different bacterial species may be attributed to the way each bacteria attached to the minerals and their different reduction pathways. SEM images confirmed that Pseudomonas cells were much more tightly packed on the mineral surfaces than were Shewanella. The images also confirmed that Shewanella oneidensis MR-1 produced nanowires. The results suggest that the dominant Cr(VI) reduction pathway for Pseudomonas fluorescens LB 300 may have been through membrane-bound enzymes, whilst for Shewanella oneidensis MR-1 it was probably via extracellular electron transfer. Since different minerals impact differentially on bacterial Cr(VI) reduction and isotope fractionation, variations of mineralogies and the associated changes of bacterial communities should be taken into consideration when using Cr isotopes to quantify Cr redox behaviour in the environment. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122058
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Department of Engineering Science, University of Oxford, Oxford, United Kingdom; Max Planck Institute for Chemistry, Climate Geochemistry Department, Mainz, 55128, Germany
Recommended Citation:
Zhang Q.,Amor K.,Galer S.J.G.,et al. Using stable isotope fractionation factors to identify Cr(VI) reduction pathways: Metal-mineral-microbe interactions[J]. Water Research,2019-01-01