natural abundance

(redirected from Isotopic abundances)

natural abundance

[′nach·rəl ə′bən·dəns]
(nucleonics)
The abundance ratio of an isotope in a naturally occurring terrestrial sample of an element.
References in periodicals archive ?
Masses) of exotic neutron-rich nuclei are needed because they determine the path for the process and therefore have a direct effect on the final isotopic abundances.
Gas chromatography/ combustion/isotope ratio mass spectrometric comparison of N-acetyl- and N-pivaloyl amino acid esters to measure 15N isotopic abundances in physiological samples: a pilot study on amino acid synthesis in the upper gastrointestinal tract of minipigs.
These fine powders will then travel down tubes to a pair of instruments housed inside the rover that will analyze the samples' elemental and isotopic abundances, identify specific minerals, and test for the presence of organic compounds.
Every two years, the International Union of Pure and Applied Chemistry (IUPAC) Commission on Isotopic Abundances and Atomic Weights meets to discuss how best to communicate the latest data on various elements.
Probing isotopic abundances can also tell scientists about ancient climates, the early solar system and much more.
The TOF mass spectrometer provides exact masses and accurate isotopic abundances that can be used to confirm sample composition or determine the elemental composition of unknowns.
Trace element, rare-earth-element (REE) and isotopic abundances reflect a variety of factors including the source of the magma, the percentage of the source rock that undergoes melting, the extent of crystal fractionation, and the contamination of either magma from adjacent rocks or from other magmas of other arc systems.
The ability to detect differences depends on a number of factors, including the purity of the separated tracer, the total amount of the element under investigation, and the sensitivity of the instruments for measuring the isotopic abundances.
1994, Reporting of stable hydrogen, carbon, and oxygen isotopic abundances, Pure and Applied Chemistry, vol.
The relative isotopic abundances of the Cd isotopes added in the spike and indigenous Cd are given in Table 1.
normanii, detritus, and to a lesser extent microphytobenthos, is consistent with the copepods' natural isotopic abundances and values of [delta][[N.