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Additional info for Reference Mtls for the Stable Isotopes of Light Elements (IAEA TECDOC-825)
Sample text
However, the data and the comments of the analysts do not indicate a consistent problem with any of the materials for sample sizes in the range of 10 to 100 /xmol of N (see also [7] for homogeneity tests of USGS25, USGS26, and USGS32). Some laboratories reported regrinding and homogenizing the salts before analyzing them; that practice, if followed elsewhere, apparently removed measurable isotopic heterogeneity if it existed in the original materials. 6. S.
95%o. This value was adopted by consensus [2]. Again, this viable solution has had little distribution and is seldom employed. The 62H and 518O values of VSMOW lie closer to the upper end of the range of abundances of 2H and 18O of naturally occurring materials. By recommending 02H and 518O values of a reference material close to the lower end of the range of abundances of 2H and 18O of naturally occurring materials, the IAEA effectively normalized these scales. The IAEA selected a water sample from Antarctica and gave it the name SLAP (Standard Light Antarctic Precipitation).
NZ2 partly fills this requirement, but in addition, there is a need for a third standard at about -30 %o to be produced and widen the span to a more useful 50 %o. Furthermore, a BaSO4 with 'light' sulphur and oxygen isotopic compositions is also required. , "Comparison of the isotopic constitution of terrestrial and meteoritic sulfur". Phys. Rev. 78 (1950) 307-308. L. Jensen) Proc. NSF Symp. Yale Univ. (1962) 30-35. L. Jensen) Proc. NSF Symp. Yale Univ. (1962) 16-29. , "Standards for stable isotope measurements on natural compounds".
Reference Mtls for the Stable Isotopes of Light Elements (IAEA TECDOC-825)
by Ronald
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