Results 251 to 260 of about 71,609 (291)

Speciated isotope dilution analysis of Cr(III) and Cr(VI) in water by ICP-DRC-MS

Talanta, 2008
An isotope dilution method has been developed for the speciation analysis of chromium in natural waters which accounts for species interconversions without the requirement of a separation instrument connected to the mass spectrometer. The method involves (i) in-situ spiking of the sample with isotopically enriched chromium species; (ii) separation of ...
H-L, Ma, P A, Tanner
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Oxygen isotope variations in Cr-poor megacrysts from kimberlite

Geochimica et Cosmochimica Acta, 2001
Abstract As radiogenic isotope compositions of Cr-poor megacrysts from kimberlite demonstrate that the megacrysts and kimberlite hosts are genetically related (megacrysts are likely deep-seated liquidus phases), the oxygen isotope compositions of Cr-poor megacrysts are indicative of the δ18O of the host kimberlites and their mantle source regions ...
Daniel J. Schulze, John R. Valley, David R. Bell, Michael J. Spicuzza   +3 more
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Elastic 3He scattering from Ca, Ti and Cr isotopes

Nuclear Physics A, 1972
Abstract The elastic 3 He scattering on 40 Ca, 44 Ca, 48 Ca, 46 Ti, 48 Ti, 50 Ti, 50 Cr, 52 Cr and 53 Cr has been investigated at E 3He = 29 MeV from θ = 14° up to θ = 160°. Average sets of parameters have been obtained from optical-model analyses describing the data on the different nuclei equally well, except 40 Ca.
H.P. Morsch, R. Santo
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Hydrogen Isotope Effects in Ti–V–Cr Alloy Hydrides

The Journal of Physical Chemistry C, 2015
The hydrogen isotope effects are systematically investigated by measuring the equilibrium separation factor (α) in Ti–V–Cr alloys with mixed H–D systems at 30 °C. We find that all of the alloys are BCC structures except for TiCr. Interestingly, α displays a parabolic relation with respect to the number of valence electrons per metal atom (e/a) for V 40
Yongbin Yang, Deli Luo, Wensheng Guo, Xiaoqiu Ye   +3 more
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Global Cr-isotope distributions in surface seawater and incorporation of Cr isotopes into carbonate shells

2015
In this study we present the Cr-isotope composition of surface seawater from several locations worldwide. In addition to the samples from the oceans (Atlantic Ocean, Pacific Ocean, Southern Ocean and Artic Ocean) we analysed water samples from areas with a more limited water exchange (Mediterranean Sea, Baltic Sea, Øresund and Kattegat).
Paulukat, Cora Stefanie, Frei, Robert, Vögelin, Andrea Regula, Samankassou, Elias   +3 more
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Hydrogen isotopic composition of the water in CR chondrites

Geochimica et Cosmochimica Acta, 2013
Abstract The thermal and aqueous alteration experienced by QUE 99177, MET 00426, EET 92042, GRA 95229, Renazzo and Al Rais CR chondrites was assessed through multi-technique characterization of their the carbonaceous matter and hydrated mineral phases.
Bonal, L., Alexander, C. M. O. 'D., Huss, G. R., Nagashima, K., Quirico, E., Beck, P.   +5 more
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Chromium isotopic fractionation during Cr(VI) reduction in groundwaters.

2005
frazionamento isotopico del cromo in acque ...
PETRINI R., SLEJKO F. F., OTTONELLO, GIULIO ARMANDO, MARINI, LUIGI, ACCORNERO M., VETUSCHI ZUCCOLINI, MARINO   +5 more
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Search for $��$-cluster states in even-even Cr isotopes

2016
The $ + \mathrm{core}$ structure is investigated in even-even Cr isotopes from the viewpoint of the local potential model. The comparison of $Q_ /A$ values for even-even Cr isotopes and even-even $A = 46,54,56,58$ isobars indicates that $^{46}$Cr and $^{54}$Cr are the most favorable even-even Cr isotopes for $ $-clustering. The ground state bands of
Souza, M. A., Miyake, H.
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Cr and Ti isotope systematics of Ryugu samples

Goldschmidt2022 abstracts, 2022
Tetsuya Yokoyama, Tsuyoshi Iizuka, Ikshu Gautam, Yuki Masuda, Yuki Hibiya, Makiko Haba, Ryota Fukai, Hisayoshi Yurimoto   +7 more
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Isotopes in comets: Implications from Cr in carbonaceous chondrites

Space Science Reviews, 1991
According to their chemical composition, rich in volatile compounds, comets are thought to be primitive materials. They may provide prime samples for the study of nucleosynthetic components of the solar system and of the processes occurring during the formation of the outer planets. Their origin is largely a matter of conjecture.
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