im asking if in groundwater, the Barium isotopes as 137Ba have a similar behaviour with barium element ? for example in the co-precipitation process .
thank you if you suggest also some works on barium and their isotopes in groundwater.
Barium the element is comprised of 7 naturally occurring isotopes of Barium, 137Ba being the second most abundant one of them at about 12% of the total...roughly 72% is comprised of 138Ba. While not a field I am familiar with, ratios of barium isotopes have been used as tracers to shed light on geochemical processes, at least in marine environments, and typical compare rations of 138ba/134ba or 137Ba/134Ba against some standard ratio. Attached is a paperI came across that may provide an example of barium isotope data in a marine context (see section 2.6.)
Barium isotope fractionation during the experimental transformation of aragonite to witherite and of gypsum to barite, and the effect of ion (de)solvation
Michael E. Böttcher et al.
Isotopes in Environmental and Health Studies , V54 issu 3 Published 06 2018
ABSTRACT
In this study, we present the experimental results for stable barium (Ba) isotope fractionation (137Ba/134Ba) during the transformation of aragonite (CaCO3) and gypsum (CaSO4·2H2O) in Ba-bearing aqueous solution to witherite (BaCO3) and barite (BaSO4), respectively. The process was studied at three temperatures between 4 and 60 °C. In all cases, the transformation leads to a relative enrichment of the lighter 134Ba isotope in the solid compared to the aqueous solution, with 137/134Ba enrichment factors between –0.11 and −0.17 ‰ for BaCO3, and –0.21 and –0.26 ‰ for BaSO4. The corresponding mass-dependent 138/134Ba enrichment factors are −0.15 to –0.23 ‰ for BaCO3, and –0.28 to –0.35 ‰ for BaSO4. The magnitude of isotope fractionation is within the range of recent reports for witherite and barite formation, as well as trace Ba incorporation into orthorhombic aragonite, and no substantial impact of temperature can be found between 4 and 80 °C. In previous studies, ion (de)solvation has been suggested to impact both the crystallization process of Ba-bearing solids and associated Ba isotope fractionation. Precipitation experiments of BaSO4 and BaCO3 using an methanol-containing aqueous solution indicate only a minor effect of ion and crystal surface (de)solvation on the overall Ba isotope fractionation process.
Dear Youcef Zemour chemically there should be no measurable difference between the various isotopes of barium. The compounds like BaCO3 and BaSO4 should have the same low solubility in water no matter of the respective isotopes. Please also see this potentially useful article entitled "Assessing barium and strontium concentrations and speciation in groundwater from the area of the future weak and medium radioactive waste repository Saligny – Romania". The paper is available as public full text on RG:
Article Assessing barium and strontium concentrations and speciation...
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