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 and Its Pitzer Model: Applications to Nuclear Waste Isolation and Other Low Temperature Environments
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group
In this study, solubility measurements on tri-calcium di-citrate tetrahydrate [Ca3[C3H5O(COO)3]2•4H2O, abbreviated as Ca3[Citrate]2•4H2O] 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 (log K$$0\atop{sp}$$) for Ca3[Citrate]2•4H2O and formation constant (logβ$$0\atop{1}$$) for Ca[C3H5O(COO)3]–Ca3[C3H5O(COO)3]2•4H2O (earlandite) = 3Ca2+ + 2[C3H5O(COO)3]3– + 4H2O (1) Ca2+ + [C3H5O(COO)3]3– = Ca[C3H5O(COO)3]– (2) are determined as –18.11 ± 0.05 and 4.97 ± 0.05, respectively, based on the Pitzer model with a set of Pitzer parameters describing the specific interactions in NaCl and MgCl2 media.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Management (EM); USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- AC04-94AL85000; NA0003525
- OSTI ID:
- 1429636
- Report Number(s):
- SAND--2017-10455J; 657330
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crystal structure of neodymium 2-methoxybenzoate tetrahydrate Nd(2-CH/sub 3/OC/sub 6/H/sub 4/COO)/sub 3/ x 4H/sub 2/O
The crystal structure of calcium aqua{l_brace}ethylenediaminetetraacetato(3-){r_brace}nickelate(II) tetrahydrate, Ca[Ni(HEdta)(H{sub 2}O)]{sub 2}.4H{sub 2}O