Isotopic exchange hydrogen

Isotopic exchange of carbon-bound hydrogen over geologic ...

Isotopic exchange of carbon-bound hydrogen over geologic ...

1. Introduction. Hydrogen isotope ratios (2 H/ 1 H, or D/H) of individual organic compounds are being used to reconstruct D/H ratios of paleoenvironmental water and hence climatic records Xie et al 2000, Sauer et al 2001, Huang et al 2002.Whereas similar attempts using bulk isotopic analyses have had to contend both with complex mixtures of organic material and with the rapid exchange of O …

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Hydrogen Isotope Exchange – The Chirik Group

Hydrogen Isotope Exchange – The Chirik Group

Hydrogen Isotope Exchange. Replacing C-H bonds with deuterium or tritium is a common tool for understanding pharmacokinetic and pharmacodynamics properties in drug molecules and is a critical component of the drug discovery and registration process. For tritiation, ...

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Isotopic Exchange | Article about Isotopic Exchange by The ...

Isotopic Exchange | Article about Isotopic Exchange by The ...

isotopic exchange[¦ī·sə¦täp·ik iks′chānj] (physical chemistry) A process in which two atoms belonging to different isotopes of the same element exchange valency states or locations in the same molecule or different molecules. Isotopic Exchange a chemical process involving the redistribution of the isotopes of an element between reacting ...

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Hydrogen isotope biogeochemistry - Wikipedia

Hydrogen isotope biogeochemistry - Wikipedia

Hydrogen isotope biogeochemistry is the scientific study of biological, geological, and chemical processes in the environment using the distribution and relative abundance of hydrogen isotopes.There are two stable isotopes of hydrogen, protium 1 H and deuterium 2 H, which vary in relative abundance on the order of hundreds of permil.The ratio between these two species can be considered the ...

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Isotopic exchange between hydrogen from the gas phase and ...

Isotopic exchange between hydrogen from the gas phase and ...

7/19/2018 · Without the isotopic effects the time constants are directly equal to the heterogeneous exchange rate. In case of hydrogen isotope exchange with isotopic effect in order to find the precise values of r H (D) and r H (H) it is necessary to calculate the isotopic ratios (11).

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Combined Electrolysis Catalytic Exchange (CECE) Process ...

Combined Electrolysis Catalytic Exchange (CECE) Process ...

Hydrogen isotopes can be separated efficiently by a process which combines an electrolysis cell with a trickle bed column packed with a hydrophobic platinum catalyst. The column effects isotopic exchange between counter-current streams of electrolytic hydrogen and liquid water while the electrolysis ...

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Hydrogen Isotope Exchange in Hydrocarbons | Deep Carbon ...

Hydrogen Isotope Exchange in Hydrocarbons | Deep Carbon ...

Hydrogen isotope (2 H and 1 H) exchange between hydrocarbons and water under hydrothermal conditions was investigated by Eoghan Reeves (MIT/WHOI) and others at Woods Hole Oceanographic Institution [1].Their experiments involved heating linear chains of carbon and hydrogen atoms specifically C1 to C5 n …

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Isotopic labeling - Wikipedia

Isotopic labeling - Wikipedia

4/4/2012 · Isotopic labeling (or isotopic labelling) is a technique used to track the passage of an isotope (an atom with a detectable variation in neutron count) through a reaction, metabolic pathway, or cell. The reactant is 'labeled' by replacing specific atoms by their isotope. The reactant is then allowed to undergo the reaction.

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Hydrogen isotopic exchange in palladium hydride

Hydrogen isotopic exchange in palladium hydride

Download Citation on ResearchGate | Hydrogen isotopic exchange in palladium hydride | We have recently developed the laser-Raman technique as a means of unambiguouslymeasuring the partial ...

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Isotopic exchange of carbon-bound hydrogen over geologic ...

Isotopic exchange of carbon-bound hydrogen over geologic ...

Request PDF on ResearchGate | Isotopic exchange of carbon-bound hydrogen over geologic timescales | The increasing popularity of compound-specific hydrogen isotope (D/H) analyses for investigating ...

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INVESTIGATION OF ISOTOPIC EXCHANGE OF HYDROGEN BETWEEN ...

INVESTIGATION OF ISOTOPIC EXCHANGE OF HYDROGEN BETWEEN ...

@article{osti_4765602, title = INVESTIGATION OF ISOTOPIC EXCHANGE OF HYDROGEN BETWEEN WATER AND THIOLS, author = Sakodynskii, K.I. and Babkov, S.I. and Zhavoronkov, N.M., abstractNote = {The partition coefficients for hydrogen isotopes between water and thiols of composition C/sub 4/---C/sub 9/ were determined at 20 to 80 deg . The kinetics of isotopic exchange between water and thiols was ...

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Isotopic exchange of hydrogen in aromatic amino acids ...

Isotopic exchange of hydrogen in aromatic amino acids ...

The isotopic effects of hydrogen and the values of the activation energy of H-D exchange in different positions of the aromatic ring in tryptophan and tyrosine were determined. The effect of properties of the medium on the rate of the isotopic exchange of hydrogen is discussed. 17 refs., 2 figs., 2 tabs.

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US7153486B2 - Wetproofed catalysts for hydrogen isotope ...

US7153486B2 - Wetproofed catalysts for hydrogen isotope ...

A method to catalyze hydrogen isotope exchange between water and hydrogen in which the water and hydrogen are contacted with a wetproofed catalyst, the catalyst having a hydrophobic porous matrix which has dispersed therein catalytically active platinum and at least one other metal which is chromium or titanium.

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Isotopic exchange of carbon-bound hydrogen over geologic ...

Isotopic exchange of carbon-bound hydrogen over geologic ...

the rapid exchange of O- and N-bound hydrogen (Krishnamur-thy et al., 1995), the analysis of individual compounds such as n-alkanes and sterols potentially avoids both problems. With this opportunity come new questions about the isotopic fidelity of carbon-bound hydrogen over geologic timescales. Current

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Hydrogen isotopic exchange between D2 and H2O on alumina ...

Hydrogen isotopic exchange between D2 and H2O on alumina ...

Hydrogen isotopic exchange between D2 and H,O has been investigated on alumina prepared by sputtering at 803 K and at low pressures. The alumina is amorphous, consisting of aluminum with coordination numbers four, five, and six in the ratio 1 : 2: 1 as determined by NMR. A kinetic model is proposed on the basis of the pressure dependence of the

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Kinetics of isotopic exchange reaction between hydrogen ...

Kinetics of isotopic exchange reaction between hydrogen ...

The isotopic exchange reaction between hydrogen and water vapor was studied for the temperature range 313 K to 353 K over platinum supported on hydrophobic styrene‐divinylbenzene copolymer beads, and, for comparison, platinum supported on hydrophilic alumina pellets.

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