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- W3113222304 abstract "In this study, solubility measurements on tri-calcium di-citrate tetrahydrate [Ca3[C3H5O(COO)3]2•4H2O, abbreviated as Ca3[Citrate]2•4H2O, earlandite] as a function of ionic strength are conducted in NaCl solutions up to I = 5.0 mol kg−1 and in MgCl2 solutions up to I = 7.5 mol kg−1, at room temperature (22.5 ± 0.5 °C). The solubility constant (logKsp0) for Ca3[Citrate]2•4H2O and formation constant (logβ10) for Ca[C3H5O(COO)3]–,(1)Ca3[C3H5O(COO)3]2•4H2O (earlandite) = 3Ca2+ + 2[C3H5O(COO)3]3– + 4H2O(2)Ca2+ + [C3H5O(COO)3]3– = Ca[C3H5O(COO)3]–are determined as −18.11 ± 0.15 and 4.97 ± 0.15, respectively, with a set of Pitzer parameters describing the specific interactions in NaCl-bearing and MgCl2-bearing media. The solubility measurements and thermodynamic modeling indicate that earlandite could become a solubility-controlling phase for citrate in the near field of geological repositories for nuclear waste when the inventories of citrate reach the saturation concentrations for Ca3[Citrate]2•4H2O, and it is a solubility-limiting phase for calcium/citrate in other low temperature environments such as agro-food industrial waste-waters. The Pitzer model presented in this work will enable researchers to assess the role of citrate in low temperature environments over a wide range of ionic strengths, and is expected to find applications in many fields such as food and pharmaceutical sciences, cement and concrete industries as well as nuclear waste management." @default.
- W3113222304 created "2020-12-21" @default.
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- W3113222304 date "2021-02-01" @default.
- W3113222304 modified "2023-10-12" @default.
- W3113222304 title "Experimental determination of solubilities of tri-calcium di-citrate tetrahydrate [Ca3[C3H5O(COO)3]2•4H2O], earlandite, in NaCl and MgCl2 solutions to high ionic strengths" @default.
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- W3113222304 doi "https://doi.org/10.1016/j.apgeochem.2020.104856" @default.
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