Results 51 to 60 of about 2,447 (151)

Isotopic Compositions and Elemental Abundances of Chromium in Presolar Silicon Carbide Grains from Asymptotic Giant Branch Stars

The Astrophysical Journal
Isotopes of chromium (Cr) and other iron-group elements are predominantly made in the inner shells of supernovae and are later reprocessed via the slow neutron capture process ( s -process) in asymptotic giant branch (AGB) stars.
Kuljeet K. Marhas, Manish N. Sanghani, Scott R. Messenger, Antariksha Mitra, Ritesh K. Mishra   +4 more
doaj   +1 more source

Geochemical characteristics and implications of pyrite sulfur isotope in Fengcheng Formation of Mahu Sag, Junggar Basin

Shiyou shiyan dizhi
The Fengcheng Formation in the Mahu Sag of the Junggar Basin spans the Carboniferous and Permian boundary and represents a typical shale oil reservoir deposited in a marine to continental transitional environment.
Chengzhou JIANG, Guiwen WANG, Song WANG, Yilin ZHANG, Yuyue HUANG   +4 more
doaj   +1 more source

Chromium isotope fractionation during the removal of hexavalent chromium by oak-based biochar

Chemosphere
Chromium, especially in its hexavalent form (Cr(VI)), poses significant health risks due to its carcinogenic properties. Emerging research suggests that biochar, a carbon-rich material derived from biomass pyrolysis, holds promise as an effective and sustainable solution for Cr(VI) remediation.
Filip Budimir, Carol J. Ptacek, Richard T. Amos, David W. Blowes   +3 more
openaire   +2 more sources

Preparation and Certification of Reference Materials for Hydrogen and Oxygen Isotopes in Water

Yankuang ceshi, 2013
Certified reference materials of water for stable hydrogen and oxygen isotopes were developed and have been used for more than 30 years. However, they no longer meet the requirements for newly developed technologies. New reference materials of water have
ZHANG Lin, LIU Fu-liang, JIA Yan-kun, LIU Jun   +3 more
doaj  

Zoning and contamination rate of magnesium and heavy metals of iron, zinc and copper in the north and northwest aquifer of Khoy (Zourabad) based on GIS and determining the contaminated source

Journal of Economic Geology, 2015
Introduction Heavy metals are the most toxic pollutants in aquatic ecosystems. This contamination can result from the release of heavy metal elements during alteration and weathering of ultramafic and mafic rocks (ophiolite zones).
Fariborz Khodadadi, Abdolnaser Fazlnia, Hossein Pirkharrati   +2 more
doaj  

Volatile loss following cooling and accretion of the Moon revealed by chromium isotopes. [PDF]

Proc Natl Acad Sci U S A, 2018
Sossi PA, Moynier F, van Zuilen K.
europepmc   +1 more source

Chromium isotope behaviour in natural waters

, 2017
The isotopes of chromium (Cr) fractionate during terrestrial oxidation reactions that require the presence of oxygen. The main source of Cr to the oceans is via rivers, and thus Cr isotopic signatures (expressed as δ53Cr) preserved in authigenic sediments are increasingly being used to reconstruct the oxygen levels of ancient environments.
openaire   +1 more source

Heavy metals and natural radioactive isotopes in phosphate and compound fertilisers and their impact on human health. [PDF]

Sci Rep
Łukaszek-Chmielewska A, Rachwał M, Rakowska J, Piec R, Podleśna A, Piotrowska B, Isajenko K, Mietelski JW, Kierepko R, Kosturkiewicz B.   +9 more
europepmc   +1 more source

Combustion and Pyrolysis EA-IRMS Techniques to Determine the δ²H of Diamonds. [PDF]

Rapid Commun Mass Spectrom
Fourel F, Lécuyer C, Thomassot E, Deloule E, Ojeimi C.   +4 more
europepmc   +1 more source

Trivalent chromium interacts directly with acetylated lysine. [PDF]

J Trace Elem Med Biol
Wise RM, Jiang T, Meaza I, Feng C, Wise JP, Liu KJ, Zhou X.   +6 more
europepmc   +1 more source