Properties
Boron, a group 13 metalloid, has two natural occurring stable isotopes, 11B (11.00930536[45]) and 10B (10.01293695[41]), with relative abundances of 0.199(7) and 0.801(7), respectively, and hence occurs approximately in a 4:1 ratio (source of data: National Institute of Standards and Technology, http://www.nist.gov/pml/data/comp.cfm). Numerous radioisotopes of boron also occur with masses from 7B to 17B, but their half-lives are all <1 s. As with other stable isotopic systems, natural isotope variation is described using delta notation, i.e., the per mil variation from the 11B/10B ratio of the synthetic boric acid international reference material NIST SRM-951 (atom%: 11B = 80.173 ± 0.013; 10B = 19.827 ± 0.013; Catanzaro et al. 1970). This can be described by the following equation:
In natural systems, boron is almost exclusively found bound...
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Foster, G.L., Lécuyer, C., Marschall, H.R. (2018). Boron Stable Isotopes. In: White, W.M. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-39312-4_238
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