Chlorine isotopes also have been fractionated photochemically in the laboratory.Įnvironmental chloride samples are reported to have δ( 37Cl) values ranging from about The lighter isotope 35Cl diffuses more rapidly inĪqueous solutions, whereas the concentration of the heavier isotope 37Cl is higher in halide minerals Ion filtration, and halide mineral precipitation. Measurements currently is standard mean ocean chloride (SMOC), with δ( 37Cl) = 0 ‰, despite reportedĮvidence for variability in n( 37Cl)/ n( 35Cl) of seawater chloride.Ĭhlorine isotopes in the chloride ion may be fractionated in nature and the laboratory by diffusion, The basis of the delta scale for relative Cl isotope-ratio To increase the uncertainty and remove a significant figure from the atomic weight of chlorine, and to introduce the interval notation in 2009. Since 1985, relative isotope-ratio mass spectrometry has yielded abundant evidence for variability in theĪtomic weight of chlorine in both natural and artificial substances, which resulted in the 1999 decision
Of atomic weights of several other elements, the Commission did not assign any new atomic-weight valuesĭefined purely on the basis of chemical measurements. Silver and on Ag/AgCl equivalent ratios determined chemically by many well-known authorities.įollowing its 1967 discussion of Ag, Cl, and Br, which were important in the chemical determination In 1961, the Commission recommended A r(Cl) = 35.453(1), based on the atomic weight of
0 kommentar(er)
