![]() Variations in the isotopic composition of hydrogen in chemicals and natural Of 0.3 ‰, which is equal to or slightly smaller than typical uncertainties of most relative isotope-ratio measurements of H. The uncertainty of that value corresponds to a δ(²H) uncertainty According to this measurement, VSMOW has an amount fraction of x(²H) = 0.000 155 74(5), corresponding Material endorsed by CIAAW as the basis of the delta scale for relative isotope-ratio measurements. Single natural source was performed on VSMOW (distributed by the IAEA and NIST), the reference The currently accepted best measurement of the isotopic composition of hydrogen from a On the average and the range of ²H concentrations measured in hydrogen extracted from fresh- and saltwaters however, it was noted that substances other than water could have a wider range of atomic In its report for 1961, CIAAW recommended A r(H) = 1.007 97(1) based The atomic weight of hydrogen has been based on mass-spectrometric The low concentration of ²H in normal sources of hydrogen may have delayed itsĭiscovery until 1931 when hydrogen isotope fractionation was demonstrated by distillation, electrolysis, evaporation,Īnd in environmental samples. The minor stable isotope ²H is known asĭeuterium, with symbol D. The major stable isotope ¹H is also known as protium.
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