IUPAC Commission on atomic weights and isotopic abundances

Journal Article · · Journal of Physical and Chemical Reference Data; (United States)

OSTI ID:5042759

The biennial review of atomic weight, A[sub r](E), determinations and other cognate data has resulted in changes for the standard atomic weight of indium from 114.82[+-]0.01 to 114.818[+-]0.003, for tungsten from 183.85[+-]0.03 to 183.84[+-]0.01 and for osmium from 190.2[+-]190.23[+-]0.03 due to new high precision measurements. Recent investigations on silicon and antimony confirmed the presently accepted A[sub r] values. The footnote [open quotes]g[close quotes] was added for carbon and potassium because it has come to the notice of the Commission that isotope abundance variations have been found in geological specimens in which these elements have an isotopic composition outside the limits for normal material. The value of 272 is recommended for the [sup 14]N/[sup 15]N ratio of N[sub 2] in air for the calculation of atom percent [sup 15]N from measured [sigma][sup 15]N values. Because many elements have a different isotopic composition in non-terrestrial materials, recent data on non-terrestrial material are included in this report for the information of the interested scientific community. 67 refs., 2 figs., 5 tabs.

• OSTI ID: 5042759
• Journal Information: Journal of Physical and Chemical Reference Data; (United States), Vol. 22:6; ISSN 0047-2689
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
CARBON
ISOTOPE RATIO
INDIUM
MASS NUMBER
OSMIUM
POTASSIUM
TUNGSTEN
ABUNDANCE
CORRECTIONS
ELEMENTS
STANDARDS
ALKALI METALS
METALS
NONMETALS
PLATINUM METALS
TRANSITION ELEMENTS
400100* - Analytical & Separations Chemistry
360606 - Other Materials- Physical Properties- (1992-)
360104 - Metals & Alloys- Physical Properties