vanadium isotope composition of seawater
First-principles investigation of vanadium isotope fractionation in suggests that V isotope composition of seawater might vary with change of ambient oxygen levels. Thus and Wanty, 1991). Especially as V has multiple valances in sea-water, it can be used as a redox tracer to study paleo-environment * Co-rst author, corresponding First-principles investigation of vanadium isotope Sep 01, 2015 · Equilibrium fractionation factors of vanadium (V) isotopes among tri- (V(III)), tetra- (V(IV)) and penta-valent (V(V)) inorganic V species in aqueous system and during adsorption of V(V) to goethite are estimated using first-principles calculation. Our results highlight the dependence of V isotope fractionation on valence states and the chemical binding environment.
We applied the proposed method to four kinds of seawater samples. The Mo compositions were constant among them, with average 98/95Mo and 92/98Mo values of 2.45 ± 0.11 and 4.94 ± 0.09 (±2 SD), respectively. Our data indicate that seawater is enriched in heavy Mo isotopes than previously reported. Redox control on the tungsten isotope composition of May 04, 2021 · Consistent with experimental studies, the preferential scavenging of isotopically light W by Mn-oxides increases the 186/184 W of surrounding seawater, whereas the redissolution of Mn-oxides causes decreasing seawater 186/184 W. Overall, the distinctly heavy stable W isotopic signature of open ocean seawater mirrors predominantly fully oxic conditions in modern oceans. Sebastian Viehmann - Bernhard GrasemannThesis topic:The evolution of Precambrian environments and their impact on the trace element and Hf-Nd isotopic composition of ancient seawater. Analytical improvement and implications for vanadium isotope fractionation. Chemical Geology 528, 5 December 2019, 119261. DOI:10.1016/j.chemgeo.2019.07.036.
Vanadium isotope ratios (51V/50 V) have potential to provide information about changes in past ocean oxygen contents. In particular, V isotopes may nd utility in tracing variations at nonzero Vanadium and its isotope composition of river water and Dec 05, 2019 · The V isotope composition of a sample from the phosphorite layer has been analyzed by Brüske et al. (2015) with a 51 V AA of ca. 1.2. This sample was however taken at a different location than FCW-7 but is of the same stratigraphic age, and its reference to the host rock of the water source of this study needs to be taken with caution.Vanadium isotope composition of seawater - ScienceDirectThe speciation, burial, and isotopic composition of vanadium (V) in seawater is predicted to be closely coupled to the redox state of the oceans. While the speciation and burial terms are reasonably constrained, the V isotopic composition of seawater has remained elusive owing to significant analytical challenges.