Results 11 to 20 of about 27,362 (303)

Experimental and theoretical investigations of stable Sr isotope fractionation during its incorporation in aragonite [PDF]

, 2023
International audienceStrontium partitioning and isotope fractionation between aragonite and fluid have been determined experimentally at low values of the fluid saturation state (Ω) with respect to this mineral (1.1 ≤ Ω aragonite ≤ 2.2), and the ...
Jean-Michel Brazier, Marc Blanchard, Brazier, Jean-Michel, Blanchard, Marc, Jacques Schott, Schott, Jacques, Merlin Méheut, Anne-Désirée Schmitt, Méheut, Merlin, Vasileios Mavromatis, Schmitt, Anne-Désirée, Mavromatis, Vasileios   +11 more
core   +1 more source

Nitrogen isotope dynamics and fractionation during sedimentary denitrification in Boknis Eck, Baltic Sea [PDF]

Biogeosciences, 2013
The global marine nitrogen cycle is constrained by nitrogen fixation as a source of reactive nitrogen, and denitrification or anammox on the sink side. These processes with their respective isotope effects set the marine nitrate 15N-isotope value (δ
K. Dähnke, B. Thamdrup
doaj   +1 more source

Carbon isotope fractionation during aerobic biodegradation of trichloroethene by Burkholderia cepacia G4: a tool to map degradation mechanisms [PDF]

, 2002
The strain Burkholderia cepacia G4 aerobically mineralized trichloroethene (TCE) to CO2 over a time period of similar to20 h. Three biodegradation experiments were conducted with different bacterial optical densities at 540 nm (OD(540)s) in order to test
Schuth, Christoph, Downey, Angela, Larkin, Mike, Bill, Markus, Schuth, C., Bill, M., Markus Bill, Slater, G., Kalin, Robert M., Kalin, R.M., Barth, JAC, Angela Downey, Robert M. Kalin, Larkin, Michael, Slater, Greg F., Christoph Schüth, Larkin, M., Mike Larkin, Kalin, R., Johannes A. C. Barth, Greg Slater, Downey, A., Kalin, Bob, Slater, Greg, Barth, J.A.C., Barth, Johannes A. C.   +25 more
core   +1 more source

FRAME—Monte Carlo model for evaluation of the stable isotope mixing and fractionation

PLoS ONE, 2022
Bayesian stable isotope mixing models are widely used in geochemical and ecological studies for partitioning sources that contribute to various mixtures.
Maciej P. Lewicki, Dominika Lewicka-Szczebak, Grzegorz Skrzypek   +2 more
doaj   +2 more sources

More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland

Scientific Reports, 2021
Although redox reactions are recognized to fractionate iron (Fe) isotopes, the dominant mechanisms controlling the Fe isotope fractionation and notably the role of organic matter (OM) are still debated. Here, we demonstrate how binding to organic ligands
Elaheh Lotfi-Kalahroodi, Anne-Catherine Pierson-Wickmann, Olivier Rouxel, Rémi Marsac, Martine Bouhnik-Le Coz, Khalil Hanna, Mélanie Davranche   +6 more
doaj   +1 more source

Experimental and theoretical modelling of kinetic and equilibrium Ba isotope fractionation during calcite and aragonite precipitation [PDF]

, 2020
Barium isotope fractionation during calcite and aragonite inorganic precipitation was studied in mixed flow reactors as a function of precipitation rate at 25 °C and pH = 6.3 ± 0.1.
van Zuilen, Mark, van Zuilen, Kirsten, Blanchard, Marc, Schott, Jacques, van Zuilen, Kirsten; id_orcid, Dietzel, Martin, Mavromatis, Vasileios   +6 more
core   +1 more source

Eu isotope data of NIST3117a standard reagent for determination of Eu isotope fractionation in geological rocks using MC-ICP-MS

Data in Brief, 2021
The data presented in this work summarize the results of Eu isotope ratio of NIST3117a standard reagent collected between December 2017 and July 2020, which were used standard isotope ratio for calculating delta notation of Eu isotope ratio in the ...
Seung-Gu Lee, Tsuyoshi Tanaka
doaj   +1 more source

Carbon isotope effects in the sorption of chlorinated ethenes on biochar and activated carbon

Heliyon, 2023
As an alternative to activated carbon, biochar is a promising, environmentally friendly sorbent that can be used to remove organic groundwater pollutants, such as chlorinated ethenes (CEs).
Simon Leitner, Fridjof Sobanski, Gerhard Soja, Katharina Keiblinger, Christine Stumpp, Andrea Watzinger   +5 more
doaj   +1 more source

Benchmarking the simulation of Cr isotope fractionation [PDF]

, 2015
A benchmark problem set consisting of four problem levels was developed for the simulation of Cr isotope fractionation in 1D and 2D domains. The benchmark is based on a recent field study where Cr(VI) reduction and accompanying Cr isotope fractionation ...
Wanner, Christoph, Steefel, Carl I., Alt-Epping, Peter, Druhan, Jennifer L., Amos, Richard T.   +4 more
core   +1 more source

First-principles calculations of equilibrium Ga isotope fractionations between several important Ga-bearing minerals and aqueous solutions

Scientific Reports, 2023
This study predicts the equilibrium isotope fractionation factors for some important Ga-bearing species, including major minerals, aqueous solutions and gas phase systems.
Jixi Zhang
doaj   +1 more source