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  • Title: Barium isotope fractionation during experimental formation of the double carbonate BaMn[CO3](2) at ambient temperature.
    Author: Böttcher ME, Geprägs P, Neubert N, von Allmen K, Pretet C, Samankassou E, Nägler TF.
    Journal: Isotopes Environ Health Stud; 2012 Sep; 48(3):457-63. PubMed ID: 22462732.
    Abstract:
    In this study, we present the first experimental results for stable barium (Ba) isotope ((137)Ba/(134)Ba) fractionation during low-temperature formation of the anhydrous double carbonate BaMn[CO(3)](2). This investigation is part of an ongoing work on Ba fractionation in the natural barium cycle. Precipitation at a temperature of 21±1°C leads to an enrichment of the lighter Ba isotope described by an enrichment factor of-0.11±0.06‰ in the double carbonate than in an aqueous barium-manganese(II) chloride/sodium bicarbonate solution, which is within the range of previous reports for synthetic pure BaCO (3) (witherite) formation.
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