Abstract

Absolute values have been obtained for the isotopic abundance ratios of a reference sample of chromium, using surface emission mass spectrometry. Samples of known isotopic composition, prepared from nearly pure separated chromium isotopes, were used to calibrate the mass spectrometers. The resulting absolute values are Cr<sup>50</sup>/Cr<sup>52</sup> = 0.051859 ±0.000100, Cr<sup>53</sup>/Cr<sup>52</sup> = 0.113386 ±0.000145, Cr<sup>54</sup>/Cr<sup>52</sup> = 0.028222 ±0.000059, yielding an atomic weight (C<sup>I2</sup>=12) of 51.99612 ±0.00033. The indicated uncertainties arc overall limits of error based on 95 percent confidence limits for the mean and allowances for effects of known sources of possible systematic error.

Keywords

ChromiumAtomic massNatural abundanceIsotopeAnalytical Chemistry (journal)Mass spectrometryChemistryAbundance (ecology)Environmental chemistryPhysicsAtomic physicsNuclear physicsChromatography

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Publication Info

Year
1966
Type
article
Volume
70A
Issue
2
Pages
193-193
Citations
399
Access
Closed

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W. R. Shields, Thomas J. Murphy, E.J. Catanzaro et al. (1966). Absolute isotopic abundance ratios and the atomic weight of a reference sample of chromium. Journal of Research of the National Bureau of Standards Section A Physics and Chemistry , 70A (2) , 193-193. https://doi.org/10.6028/jres.070a.016

Identifiers

DOI
10.6028/jres.070a.016