isotope fractionation


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isotope fractionation

[′ī·sə‚tōp ‚frak·shə¦nā·shən]
(nucleonics)
Natural or artificial alteration of the isotopic composition of an element via processes of diffusion, evaporation, and chemical exchange, utilizing small differences in physical and chemical properties of isotopes.
References in periodicals archive ?
Effect of salinity and humidity on I'13C value of halophytes-evidence for diffusional isotope fractionation determined by the ratio of intercellular/atmospheric partial pressure of CO2 under different environmental conditions.
This new study reveals a primary biological control step in microbial sulfur metabolism, and clarifies which cellular states lead to which types of sulfur isotope fractionation. This allows scientists to link metabolism to isotopes: by knowing how metabolism changes stable isotope ratios, scientists can predict the isotopic signature organisms should leave behind.
Specadis will (i) use the newly developed high energy resolution fluorescence detected x-ray absorption spectroscopy technique to bring, For the first time, In situ cd speciation measurements in crops and (ii), Combined with cd isotope geochemistry, Unravel the relationships between cd isotope fractionation and cd speciation changes in crops to develop a tracer of cd speciation in dilute samples.
Carbon and hydrogen isotope fractionation during methanogenesis: a laboratory study using coal and formation water.
Early experimental studies on the relationship between isotope ratios in dietary resources and consumer tissues provided valuable insight into isotope fractionation and into how macronutrients (carbohydrates, proteins, and lipids) were selectively routed versus scrambled on their way to building tissues (Ambrose and Norr 1993; Krueger and Sullivan 1984; Minagawa and Wada 1984; Schoeninger and DeNiro 1982; Tieszen and Fagre 1993).
Ding and colleagues summarize the major research findings since then, covering analytical methods of investigating silicon isotope composition, mechanisms of silicon isotope fractionation, the distribution of silicon isotopes in nature, and several aspects of silicon isotope applications.
Rickaby et al., "Controls on stable strontium isotope fractionation in coccolithophores with implications for the marine Sr cycle," Geochimica et Cosmochimica Acta, vol.
Ta[Cl.sub.5] activator was added for enhancing Sr ionisation efficiency and [H.sub.3]P[O.sub.4] for stabilising Sr isotope fractionation during measurement.
Similarly, chalcocite that precipitated from these hightemperature fluids is not anticipated to contain copper that has undergone significant copper isotope fractionation. This study includes 18 chalcocite samples from three hypogene deposits (Table 1), including an archetypal example of hypogene chalcocite at Butte, Montana [12].
The 2.17[per thousand] was used for [[delta].sup.13]C of trophic stepwise isotope fractionation of mussels (Dubois et al.