The ferrozine method revisited: Fe(II)/Fe(III) determination in natural waters

Applied Geochemistry, Journal Year: 2000, Volume and Issue: 15(6), P. 785 - 790

Published: July 1, 2000

Language: Английский

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The Archean Sulfur Cycle and the Early History of Atmospheric Oxygen

Science, Journal Year: 2000, Volume and Issue: 288(5466), P. 658 - 661

Published: April 28, 2000

The isotope record of sedimentary sulfides can help resolve the history oxygen accumulation into atmosphere. We measured sulfur isotopic fractionation during microbial sulfate reduction up to 88°C and show how rate influences preservation biological fractionations in sediments. suggests low concentrations seawater atmospheric early Archean (3.4 2.8 billion years ago). began later, Proterozoic (2.5 0.54

Language: Английский

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Isotope fractionation by natural populations of sulfate-reducing bacteria

Geochimica et Cosmochimica Acta, Journal Year: 2001, Volume and Issue: 65(7), P. 1117 - 1124

Published: April 1, 2001

Language: Английский

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Ramifications of increased salinity in tidal freshwater sediments: Geochemistry and microbial pathways of organic matter mineralization

Journal of Geophysical Research Atmospheres, Journal Year: 2006, Volume and Issue: 111(G1)

Published: Feb. 6, 2006

The effects of salinity intrusion on the anaerobic microbial and geochemical dynamics tidal freshwater sediments were investigated using flow‐through sediment reactors. In control sediments, organic matter mineralization was dominated by methanogenesis (62%), followed sulfate reduction (18%), denitrification (10%), iron (10%). Upon intrusion, nutrient (ammonium, silicate, phosphate) concentrations increased rates declined. Iron‐oxide bioavailability appeared to account for >60% oxidation several days after intrusion. However, dominant pathway (>50%) within 2 weeks accounted >95% total 4 weeks. Total in situ doubled following Increased release, decreased a rapid shift reduction, with coincident increase overall mineralization, accompanied into previously riverine sediments.

Language: Английский

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Kinetics of microbial sulfate reduction in estuarine sediments

Geochimica et Cosmochimica Acta, Journal Year: 2006, Volume and Issue: 70(5), P. 1148 - 1162

Published: Feb. 23, 2006

Language: Английский

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Reactive transport in aquatic ecosystems: Rapid model prototyping in the open source software R

Environmental Modelling & Software, Journal Year: 2011, Volume and Issue: 32, P. 49 - 60

Published: Sept. 20, 2011

Language: Английский

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Rates of sulfate reduction and metal sulfide precipitation in a permeable reactive barrier

Applied Geochemistry, Journal Year: 2002, Volume and Issue: 17(3), P. 301 - 320

Published: March 1, 2002

Language: Английский

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Benthic biogeochemistry: state of the art technologies and guidelines for the future of in situ survey

Journal of Experimental Marine Biology and Ecology, Journal Year: 2003, Volume and Issue: 285-286, P. 5 - 31

Published: Feb. 1, 2003

Language: Английский

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Temperature-driven decoupling of key phases of organic matter degradation in marine sediments

Proceedings of the National Academy of Sciences, Journal Year: 2005, Volume and Issue: 102(47), P. 17036 - 17040

Published: Nov. 14, 2005

The long-term burial of organic carbon in sediments results the net accumulation oxygen atmosphere, thereby mediating redox state Earth's biosphere and atmosphere. Sediment microbial activity plays a major role determining whether particulate is recycled or buried. A diverse consortium microorganisms that hydrolyze, ferment, terminally oxidize compounds mediates anaerobic matter mineralization anoxic sediments. Variable temperature regulation sequential processes, leading from breakdown complex to production subsequent consumption labile, low-molecular weight, dissolved intermediates, could play key controlling rates overall mineralization. We examined sediment cycling slurry flow through bioreactor experiments. data show variable response functional groups marine sediments, resulting temperature-driven decoupling intermediates. This leads at low temperatures weight limitation terminal metabolism higher temperatures.

Language: Английский

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Impacts of Shallow Geothermal Energy Production on Redox Processes and Microbial Communities

Environmental Science & Technology, Journal Year: 2013, Volume and Issue: 47(24), P. 14476 - 14484

Published: Nov. 22, 2013

Shallow geothermal systems are increasingly being used to store or harvest thermal energy for heating cooling purposes. This technology causes temperature perturbations exceeding the natural variations in aquifers, which may impact groundwater quality. Here, we report results of laboratory experiments on effect (5-80 °C) redox processes and associated microbial communities anoxic unconsolidated subsurface sediments. Both hydrochemical microbiological data showed that a increase from 11 °C (in situ) 25 caused shift iron-reducing sulfate-reducing methanogenic conditions. Bioenergetic calculations could explain this shift. A further (>45 resulted emergence thermophilic community specialized fermentation sulfate reduction. Two distinct maxima reduction rates, similar orders magnitude (5 × 10(-10) M s(-1)), were observed at 40 70 °C. Thermophilic reduction, however, had higher activation (100-160 kJ mol(-1)) than mesophilic (30-60 mol(-1)), might be due trade-off between enzyme stability activity with thermostable enzymes less efficient catalysts require energies. These reveal while functionality can withstand substantial rise, other key biochemical appear more sensitive.

Language: Английский

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