Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen [PDF]
Nature Communications, 2018 There is a long standing debate whether low atmospheric oxygen levels during the Mesoproterozoic Era hindered the evolution of crown-group animals. Here, the authors show with shale-hosted chromium isotopes that sufficient atmospheric oxygen for crown ...
Donald E. Canfield +7 more
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Biogeochemical cycling of chromium and chromium isotopes in the sub-tropical North Atlantic Ocean
Frontiers in Marine Science, 2023 Chromium (Cr) is a redox-sensitive element and because Cr isotopes are fractionated by redox and/or biological processes, the Cr isotopic composition of ancient marine sediments may be used to infer changes in past seawater oxygenation or biological ...
Wenhao Wang +6 more
doaj +3 more sources
Method validation and geochemical modelling of chromium speciation in natural waters [PDF]
Scientific ReportsThe study focuses on validating reference methods such as ICP-OES and ICP-MS for detecting ultra-trace levels of chromium in groundwater, where concentrations are typically very low.
Piotr Rusiniak +3 more
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Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone. [PDF]
Proc Natl Acad Sci U S A, 2021 Huang T, Moos SB, Boyle EA.
europepmc +2 more sources
Absence of hexavalent chromium in marine carbonates: implications for chromium isotopes as paleoenvironment proxy. [PDF]
Natl Sci Rev, 2021 Fang Z +5 more
europepmc +2 more sources
Determination of Trace Elements in Nickel-based High-temperature Alloy by High Resolution Plasma Mass Spectrometry [PDF]
Zhipu Xuebao, 2023 The nickel content of nickel-based high-temperature alloy is between 50% and 70%, and the alloy contents of chromium, iron, cobalt, molybdenum, aluminum, titanium and tungsten are within 20%.
HU Xuan1 +6 more
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Mechanisms of chromium isotope fractionation and the applications in the environment
Ecotoxicology and Environmental Safety, 2022 Chromium (Cr) is a toxic heavy metal that gives rise to environmental pollution and human risk. Chromium stable isotopes have a wide range of applications in both environmental field and earth science field.
Ying Li +5 more
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Physics Letters B, 2022 Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z=20 and 28 proton shell closures is particularly interesting due to the onset and ...
R. Silwal +26 more
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Modeling the marine chromium cycle: new constraints on global-scale processes [PDF]
Biogeosciences, 2021 Chromium (Cr) and its isotopes hold great promise as a tracer of past oxygenation and marine biological activity due to the contrasted chemical properties of its two main oxidation states, Cr(III) and Cr(VI), and the associated isotope fractionation ...
F. Pöppelmeier +8 more
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A systematic look at chromium isotopes in modern shells – implications for paleo-environmental reconstructions [PDF]
Biogeosciences, 2018 The chromium isotope system (53Cr ∕ 52Cr, expressed as δ53Cr relative to NIST SRM 979) in marine biogenic and non-biogenic carbonates is currently being evaluated as a proxy for the redox state of the ocean.
R. Frei +4 more
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