scholarly journals Evaluating zinc isotope fractionation under sulfate reducing conditions using a flow-through cell and in situ XAS analysis

2017 ◽  
Vol 203 ◽  
pp. 1-14 ◽  
Author(s):  
Julia H. Jamieson-Hanes ◽  
Heather K. Shrimpton ◽  
Harish Veeramani ◽  
Carol J. Ptacek ◽  
Antonio Lanzirotti ◽  
...  
Keyword(s):  
Isotope Fractionation ◽  
Sulfate Reducing ◽  
Zinc Isotope ◽  
In Situ Xas ◽  
Reducing Conditions ◽  
Flow Through

A flow-through reaction cell that couples time-resolved X-ray diffraction with stable isotope analysis

2011 ◽  
Vol 44 (2) ◽  
pp. 429-432 ◽  
Author(s):  
Andrew J. Wall ◽  
Peter J. Heaney ◽  
Ryan Mathur ◽  
Jeffrey E. Post ◽  
Jonathan C. Hanson ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Fractionation ◽  
Isotope Analysis ◽  
X Ray Diffraction ◽  
Reaction Cell ◽  
Time Resolved ◽  
X Ray ◽  
Flow Through

A non-metallic flow-through reaction cell is described, designed forin situtime-resolved X-ray diffraction coupled with stable isotope analysis. The experimental setup allows the correlation of Cu isotope fractionation with changes in crystal structure during copper sulfide dissolution. This flow-through cell can be applied to many classes of fluid–mineral reactions that involve dissolution or ion exchange.

scholarly journals In Situ BTEX Biotransformation under Enhanced Nitrate- and Sulfate-Reducing Conditions

1997 ◽  
Vol 31 (5) ◽  
pp. 1580-1580 ◽  
Author(s):  
M. Reinhard ◽  
S. Shang ◽  
P. K. Kitanidis ◽  
E. Orwin ◽  
G. D. Hopkins ◽  
...  
Keyword(s):  
Sulfate Reducing ◽  
Reducing Conditions

scholarly journals Diversity decoupled from sulfur isotope fractionation in a sulfate reducing microbial community

2019 ◽  
Author(s):  
Jesse Colangelo ◽  
Claus Pelikan ◽  
Craig W. Herbold ◽  
Ianina Altshuler ◽  
Alexander Loy ◽  
...  
Keyword(s):  
Microbial Community ◽  
Microbial Ecology ◽  
Sulfate Reduction ◽  
Isotope Fractionation ◽  
Sulfur Isotopes ◽  
List Type ◽  
Natural Habitats ◽  
Sulfate Reducing ◽  
Sulfate Reduction Rates

AbstractThe extent of fractionation of sulfur isotopes by sulfate reducing microbes is dictated by genomic and environmental factors. A greater understanding of species-specific fractionations may better inform interpretation of sulfur isotopes preserved in the rock record. To examine whether gene diversity influences net isotopic fractionation in situ, we assessed environmental chemistry, sulfate reduction rates, diversity of putative sulfur metabolizing organisms by 16S rRNA and dissimilatory sulfite reductase (dsrB) gene amplicon sequencing, and net fractionation of sulfur isotopes along a sediment transect of a hypersaline Arctic spring. In situ sulfate reduction rates yielded minimum cell-specific sulfate reduction rates <0.3 x 10−15 moles cell−1 day−1. Neither 16S rRNA nor dsrB diversity indices correlated with relatively constant (38 to 45‰) net isotope fractionation (ε34Ssulfide−sulfate). Measured ε34S values could be reproduced in a mechanistic fractionation model if 1-2% of the microbial community (10-60% of Deltaproteobacteria) were engaged in sulfate respiration, indicating heterogeneous respiratory activity within sulfate-metabolizing populations. This model indicated enzymatic kinetic diversity of Apr was more likely to correlate with sulfur fractionation than DsrB. We propose that, above a threshold alpha diversity value, the influence of the specific composition of the microbial community responsible for generating an isotope signal is overprinted by the control exerted by environmental variables on microbial physiology.Subject categoriesIntegrated genomics and post-genomics approaches in microbial ecologyMicrobial ecology and functional diversity of natural habitats

In Situ BTEX Biotransformation under Enhanced Nitrate- and Sulfate-Reducing Conditions

1997 ◽  
Vol 31 (1) ◽  
pp. 28-36 ◽  
Author(s):  
M. Reinhard ◽  
S. Shang ◽  
P. K. Kitanidis ◽  
E. Orwin ◽  
G. D. Hopkins ◽  
...  
Keyword(s):  
Sulfate Reducing ◽  
Reducing Conditions

Benzene oxidation under sulfate-reducing conditions in columns simulating in situ conditions

2006 ◽  
Vol 18 (5) ◽  
pp. 625-636 ◽  
Author(s):  
Carsten Vogt ◽  
Stefan Gödeke ◽  
Hanns-Christian Treutler ◽  
Holger Weiß ◽  
Mario Schirmer ◽  
...  
Keyword(s):  
Benzene Oxidation ◽  
Sulfate Reducing ◽  
Reducing Conditions ◽  
In Situ Conditions

scholarly journals In situ mobility of uranium in the presence of nitrate following sulfate-reducing conditions

2016 ◽  
Vol 187 ◽  
pp. 55-64 ◽  
Author(s):  
Charles J. Paradis ◽  
Sindhu Jagadamma ◽  
David B. Watson ◽  
Larry D. McKay ◽  
Terry C. Hazen ◽  
...  
Keyword(s):  
Sulfate Reducing ◽  
Reducing Conditions

scholarly journals Arsenic binding to organic and inorganic sulfur species during microbial sulfate reduction: a sediment flow-through reactor experiment

2013 ◽  
Vol 10 (4) ◽  
pp. 285 ◽  
Author(s):  
Raoul-Marie Couture ◽  
Dirk Wallschläger ◽  
Jérôme Rose ◽  
Philippe Van Cappellen
Keyword(s):  
Organic Matter ◽  
Sulfate Reduction ◽  
Iron Concentration ◽  
Labile Organic Matter ◽  
Sulfur Species ◽  
Sulfate Reducing ◽  
Arsenic Mobility ◽  
Microbial Sulfate Reduction ◽  
Reducing Conditions ◽  
Flow Through

Environmental context The use of water contaminated with arsenic for drinking and irrigation is linked to water and food borne diseases throughout the world. Although reducing conditions in soils and sediments are generally viewed as enhancing arsenic mobility in subsurface environments, we show they can actually promote As sequestration in the presence of reduced sulfur species and labile organic matter. We propose that sulfurisation of organic matter and subsequent binding of As to thiol groups may offer an innovative pathway for As remediation. Abstract Flow-through reactors (FTRs) were used to assess the mobility of arsenic under sulfate reducing conditions in natural, undisturbed lake sediments. The sediment slices in the FTRs were supplied continuously with inflow solutions containing sulfate and soluble AsIII or AsV and, after 3 weeks, also lactate. The experiment ran for a total of 8 weeks. The dissolved iron concentration, pH, redox potential (Eh), as well as aqueous As and sulfur speciation were monitored in the outflow solutions. In FTRs containing surface sediment enriched in labile organic matter (OM), microbial sulfate reduction led to an accumulation of organically bound S, as evidenced by X-ray absorption spectroscopy. For these FTRs, the inflowing dissolved As concentration of 20μM was lowered by two orders of magnitude, producing outflow concentrations of 0.2μM monothioarsenate and 0.1μM arsenite. In FTRs containing sediment collected at greater depth, sulfide and zero-valent S precipitated as pyrite and elemental S, while steady-state outflow arsenite concentrations remained near 5μM. The observations thus suggest that As sequestration is enhanced when sediment OM buffers the free sulfide and zero-valent S concentrations. An updated conceptual model for the fate of As in the anoxic As–C–S–Fe system is presented based on the results of this study.

Sign in / Sign up

Export Citation Format

Share Document