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isotopic exchange

Mechanisms of inorganic carbon-14 attenuation in contaminated groundwater: Effect of solution pH on isotopic exchange and carbonate precipitation reactions

Mechanisms of inorganic carbon-14 attenuation in contaminated groundwater: Effect of solution pH on isotopic exchange and carbonate precipitation reactions

... mediated isotopic exchange reactions will therefore proceed rapidly until 14/12 C ratio is equilibrated in the active surface layers of the calcite ...diffusion exchange can occur on much longer ...

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Kinetics and reactive stripping modelling of hydrogen isotopic exchange of deuterated waters

Kinetics and reactive stripping modelling of hydrogen isotopic exchange of deuterated waters

... catalytic exchange process of hydrogen for water detritiation by reactive scrubbing relied on overall mass transfer coefficients that have been fitted to experimental data from dedicated columns ...hydrogen ...

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Isotopic exchange on the diurnal scale between near-surface snow and lower atmospheric water vapor at Kohnen station, East Antarctica

Isotopic exchange on the diurnal scale between near-surface snow and lower atmospheric water vapor at Kohnen station, East Antarctica

... the isotopic composition of surface snow is essential for a more accurate interpretation of ice core ...the isotopic composition of the snow surface is observed in phase with the water vapor, reaching a ...

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Some isotopic exchange reactions of manganese

Some isotopic exchange reactions of manganese

... for the exchange studies: An appropriate amount of standard potassium permanganate was added to a solution of active man~anese II perchlorate containing enough nitric acid t o delay the [r] ...

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Isotopic Exchange of Phosphates in Soil

Isotopic Exchange of Phosphates in Soil

... the isotopic exchangeability of phosphate residues in acid soils.. 264 ROTHAMSTED REPORT FOR IS60[r] ...

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Radio analytical technique in characterization of nuclear grade ion exchangers Duolite ARA-9366B and Purolite NRW-5010

Radio analytical technique in characterization of nuclear grade ion exchangers Duolite ARA-9366B and Purolite NRW-5010

... isotopic exchange reactions are occurring simultaneously (Singare and Lokhande 2012; Lokhande and Singare 2007, 2008; Lokhande et ...ion- isotopic exchange reactions, using the two resins, the ...

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Determination of Isotopic Composition and Concentration of Uranium and Boron by Thermal Ionization Mass Spectrometric Isotopic Dilution Technique

Determination of Isotopic Composition and Concentration of Uranium and Boron by Thermal Ionization Mass Spectrometric Isotopic Dilution Technique

... For isotopic dilution analysis of uranium, two mixtures were prepared by mixing U-233 spike standard (1000 ppm U) with a natural abundance uranium secondary standard (2422 ppm ...Other isotopic ratios were ...

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Predicting trace metal solubility and fractionation in urban soils from isotopic exchangeability

Predicting trace metal solubility and fractionation in urban soils from isotopic exchangeability

... by isotopic exchange into labile and non-labile metal (Cd, Cu, Ni, Pb and Zn) as a % of total soil metal content in MA (n=23) and Urban (n=50) soils, grouped by pH ...

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The influence of the amount and the origin of calcium carbonates on the isotopically exchangeable phosphate in calcareous soils

The influence of the amount and the origin of calcium carbonates on the isotopically exchangeable phosphate in calcareous soils

... In soils from the Cretaceous Chalk, the first-order rate of isotopic exchange of the ' slow' phosphate fraction was constant. It increased to a larger but constant value in the soils inc[r] ...

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Factors influencing the isotopically exchangeable phosphate in soils Part III The effect of temperature in some calcareous soils

Factors influencing the isotopically exchangeable phosphate in soils Part III The effect of temperature in some calcareous soils

... When results for the rate of isotopic exchange in two Rothamsted soils were analysed graphically, the total isotopically exchangeable (or 'Iabile') phosphate of a soil sus[r] ...

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ABSTRACTS: October 1985185-190

ABSTRACTS: October 1985185-190

... The isotopic exchange rate with the thin film catalyst increased with the increase in the liquid : gas ratio and with the rise of the reaction temperatureY. Anion exch[r] ...

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[18F]tetrafluoroborate as a PET tracer for the sodium/iodide symporter: the importance of specific activity

[18F]tetrafluoroborate as a PET tracer for the sodium/iodide symporter: the importance of specific activity

... In this investigation, we sought to quantify the mi- nimum SA required to combine good-quality PET images in mice with maximum target-to-background ratio (TBR) in NIS-expressing tissue and to develop an alternative ...

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Studies on the classical determinism predicted by A. Einstein, B. Podolsky and N. Rosen

Studies on the classical determinism predicted by A. Einstein, B. Podolsky and N. Rosen

... One aspect of isomathematics and isomechanics which is crucial for this paper is that in all applications to date, the isotopic element T ˆ has values much smaller than 1, Eqs. (4) (5), as it has been the case ...

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High density cell water in amphibian eggs?

High density cell water in amphibian eggs?

... The isotopic water exchange method has previously been used to determine the diffusion coefficient of water in the cytoplasm and the water permeability coefficient of the plasma membrane[r] ...

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The kinetics of chlorine atom exchange between antimony trichloride and trimethylchlorosilane in benzene and hexane

The kinetics of chlorine atom exchange between antimony trichloride and trimethylchlorosilane in benzene and hexane

... halogen exchange reactions with this class of compounds would afford a useful means of elucidating such ...effect isotopic halogen exchange with halogenosilanes, and whether the mechanisms would ...

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Abundances of isotopologues and calibration of CO 2greenhouse gas measurements

Abundances of isotopologues and calibration of CO 2greenhouse gas measurements

... cylinders (> 490 µmol mol −1 ). The average offset (NOAA– INSTAAR) of non-depleted tanks is 0.0 ± 0.1 ‰ δ 13 C and 0.0 ± 0.2 ‰ δ 18 O. The offset in the highly depleted cylinders most likely occurs as a result of the ...

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Understanding wetland sub surface hydrology using geologic and isotopic signatures

Understanding wetland sub surface hydrology using geologic and isotopic signatures

... and isotopic signatures to un- derstand the present hydrological processes, sources of in- land wetland groundwater, surface water/groundwater inter- action and mixing and/or contamination of groundwater of ...

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The effects of dissolution on the silicon and oxygen isotope compositions of silica phytoliths

The effects of dissolution on the silicon and oxygen isotope compositions of silica phytoliths

... the isotopic composition of minerals (DePaolo ...the isotopic composition of the remaining phytolith silica decrease, even though the net reaction is moving forward in the direction of ...

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An isotopic and geochemical study of runoff in the Apex River watershed, Baffin Island, N.W.T.

An isotopic and geochemical study of runoff in the Apex River watershed, Baffin Island, N.W.T.

... Many northern researchers have presented evidence of groundwater discharge in permafrost areas, however no attempts have been made to quantify it (Brandon, 1963; Kalanin, 1968; Van Everdingen, 1974; See Chapter 3). ...

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Elucidation of the origins of stratospheric sulfate aerosols by isotopic methods

Elucidation of the origins of stratospheric sulfate aerosols by isotopic methods

... their isotopic composition. In this thesis project, the sulfur isotopic fractionation factors of processes that produce stratospheric sulfate aerosols (SSA) were quantified using a variety of theoretical ...

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