Tables and charts for isotope-abundance variations and atomic weights of selected elements: 2016 (Ver. 1.1, May 2018)
Dates
Publication Date
2016-12-13
Revision
2018-05-01
Info Date
2018
Citation
Coplen, T.B., and Shrestha, Y., 2016, Tables and charts for isotope-abundance variations and atomic weights of selected elements: 2016 (Ver. 1.1, May 2018): U.S. Geological Survey data release, https://doi.org/10.5066/F7GF0RN2.
Summary
Twelve chemical elements have intervals for their standard atomic weights, namely hydrogen, lithium, boron, carbon, nitrogen, oxygen, magnesium, silicon, sulfur, chlorine, bromine and thallium. Isotopic abundances, isotope-delta values, and atomic weights for each of the lower and upper bounds of materials and compounds of these 12 elements are tabulated. Version 1.1 is the most current version.
Summary
Twelve chemical elements have intervals for their standard atomic weights, namely hydrogen, lithium, boron, carbon, nitrogen, oxygen, magnesium, silicon, sulfur, chlorine, bromine and thallium. Isotopic abundances, isotope-delta values, and atomic weights for each of the lower and upper bounds of materials and compounds of these 12 elements are tabulated. Version 1.1 is the most current version.
Coplen, T.B., Shrestha, Y., 2016, Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report): Pure and Applied Chemistry, v. 88, p. 1203-1224.
There are 63 chemical elements that have two or more isotopes that are used to determine their standard atomic weights. The isotopic abundances and atomic weights of these elements can vary in normal materials due to physical and chemical fractionation processes (not due to radioactive decay). These variations are well known for 12 elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, magnesium, silicon, sulfur, chlorine, bromine and thallium), and the standard atomic weight of each of these elements is given by IUPAC (International Union of Pure and Applied Chemistry) as an interval with a lower and upper bounds. Graphical plots of selected materials and compounds of each of these elements have been published previously, and herein isotopic abundances, isotope-delta values, and atomic weights for each of the upper and lower bounds of these materials and compounds are provided. Charts showing the variations in selected materials for each element are also provided.
