Strontium isotope fractionation during precipitation of strontianite in aqueous solutions as a function of temperature and reaction rate

dc.contributor.author Alkhatib, Mahmoud
dc.contributor.author Qutob, Mutaz
dc.contributor.author Alkhatib, Samia
dc.contributor.author Eisenhauer, Anton
dc.date.accessioned 2021-12-18T12:11:46Z
dc.date.available 2021-12-18T12:11:46Z
dc.date.issued 2021-11-07
dc.description.abstract In order to study Strontium (Sr) isotope fractionation during the precipitation of strontianite (SrCO3) as a function of the specific precipitation rate (R*) and temperature (T), strontianite was precipitated at 12.5, 25.0 and 37.5 ◦C by diffusing NH3 and CO2 gases into aqueous solutions. The specific precipitation rate R* (mol/ cm2.h) for every sample was determined by applying the initial rate method. The mean isotope difference be- tween bulk solution and precipitate (∆88/86Srstrontianite-solution) was found to be − 0.279 ± 0.005‰ (2σmean) in- dependent of both rate and temperature. Hence, Sr isotope fractionation in strontianite is completely different from that in calcite and aragonite, where a strong dependency from both rate and temperature can be observed. The latter is interpreted to reflect the competition between Sr2+ and Ca2+ ions for incorporation into the calcium carbonate crystal lattice, which is absent during the precipitation of pure strontianite. The isotope difference between strontianite and bulk solution then simply reflects the intermolecular forces in the aqueous solutions as well as the kinetic effect. The difference in the (∆88/86Srstrontianite-solution between experiments then reflects the dehydration energy of Sr ions in the adsorption layer of SrCO3. en_US
dc.identifier.issn 0009-2541
dc.identifier.uri https://dspace.alquds.edu/handle/20.500.12213/6496
dc.language.iso en en_US
dc.publisher Elsevier B.V. en_US
dc.subject Strontium isotope en_US
dc.subject Fractionation en_US
dc.subject Strontianite precipitation en_US
dc.title Strontium isotope fractionation during precipitation of strontianite in aqueous solutions as a function of temperature and reaction rate en_US
dc.type Article en_US
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