The Absolute Isotopic Composition and Atomic Weight of Terrestrial Nickel
نویسندگان
چکیده
Twenty-nine samples of high-purity nickel metals, reagent salts and minerals, collected from worldwide sources, have been examined by high-precision isotope ratio mass spectrometry for their nickel isotopic composition. These materials were compared directly with SRM 986, certified isotopie standard for nickel, using identical measurement techniques and the same instrumentation. This survey shows no statistically significant variations among the samples investigated, indicating that the certified atomic weight and associated uncertainty for SRM 986 is applicable to terrestrial nickel samples. The atomic weight calculated for SRM 986 is 58.69335±0.00015 [2]. The currently recommended IUPAC value for terrestrial nickel is 58.69±0.01.
منابع مشابه
Absolute Isotopic Abundance Ratios and Atomic Weight of a Reference Sample of Nickel
Absolute values have been obtained for the isotopic abundance ratios of a reference sample of nickel (Standard Reference Material 986), using thermal ionization mass spectrometry. Samples of known isotopic composition, prepared from nearly isotopically pure separated nickel isotopes, were used to calibrate the mass spectrometers. The resulting absolute isotopic ratios are: 58Ni/60Ni=2.596061±0....
متن کاملMethodology of Lithium Analytical Chemistry and Isotopic Measurements
Lithiumwas discovered as an elemental species in 1817 by J.A.Arfvedson and isolated as ametal one year later by Sir H. Davy. The existence of two naturally occurring isotopes of lithium, Li and Li, was unambiguously proven by A.J. Dempster (1921) and the atomic weight of Li and the individual isotope masses were first determined with reasonable accuracy and precision by F.W. Aston (1932) (few a...
متن کاملIron isotopic fractionation between silicate mantle and metallic core at high pressure
The +0.1‰ elevated 56Fe/54Fe ratio of terrestrial basalts relative to chondrites was proposed to be a fingerprint of core-mantle segregation. However, the extent of iron isotopic fractionation between molten metal and silicate under high pressure-temperature conditions is poorly known. Here we show that iron forms chemical bonds of similar strengths in basaltic glasses and iron-rich alloys, eve...
متن کاملMagnesium isotopic compositions of olivine, spinel, and hibonite from the Murchison carbonaceous chondrite
The Mg isotopic compositions of olivine, spinel, and hihonite from the Murchison carbonaceous chondrite have been determined by secondary ion mass spectrometry. The olivines exhibit only marginal effects. They have no detectable intrinsic mass fractionation; however, after correcting for mass fractionation, the mean residual 26Mg/24Mg for the five grams is slightly in excess of the terrestrial ...
متن کاملIsotopic composition of Hg and Pt in 5 slowly rotating HgMn stars
Theoretical models addressing the origin of peculiarities in the spectra of HgMn stars have not been sufficiently constrained so far by the available abundance data. Previous studies of Hg and Pt in samples of HgMn stars often relied on spectra of rather low resolution and low S/N ratio, so that only limited information could be derived from the centroid wavelength of unresolved isotopic blends...
متن کامل