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- W4287511863 abstract "The relationship between the strontium partition coefficient in calcite (Ksr) and calcite precipitation rate (Rp) has been found to change systematically with pH of the solution in precipitation experiments of synthetic calcite. We hypothesize that the observed pH dependence of strontium partitioning is due to the involvement of HCO3− during calcite precipitation. We use an ion-by-ion calcite growth model which considers the contribution of both HCO3− and CO32− to calcite precipitation to test this hypothesis. Three groups of experimental data of inorganic calcite precipitation at various pH at room temperature were fit successfully with one set of parameters. The results indicate that the speciation of carbonate can explain the pH dependence of the strontium partition coefficient. Our model also reproduces observed KSr-Rp relationships at various temperatures of 5, 25 and 40 °C. This general model predicts calcite precipitation rates and strontium partition coefficients with known aqueous carbonate chemistry and provides a useful framework for understanding strontium partitioning in inorganic and biogenic calcite." @default.
- W4287511863 created "2022-07-25" @default.
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- W4287511863 date "2022-10-01" @default.
- W4287511863 modified "2023-09-25" @default.
- W4287511863 title "A model for pH dependent strontium partitioning during calcite precipitation from aqueous solutions" @default.
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- W4287511863 doi "https://doi.org/10.1016/j.chemgeo.2022.121042" @default.
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