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Title: Experimental Determination of Solubilities of Brucite [Mg(OH)2(cr)] in Na2SO4 Solutions with Borate to High Ionic Strengths: Interactions of MgB(OH)4+ with Na2SO4

Journal Article · · Journal of Solution Chemistry
ORCiD logo [1];  [1];  [1]
  1. Sandia National Lab., Carlsbad, CA (United States)
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In this paper, a solubility study on brucite [Mg(OH)2(cr)] in Na2SO4 solutions ranging from 0.01 to 1.8 mol•kg–1, with 0.001 mol•kg–1 borate, has been conducted at 22.5°C. Based on the solubility data, the Pitzer interaction parameters for MgB(OH)4+—SO42– and MgB(OH)4+—Na+ along with the formation constant for MgSO4(aq) are evaluated using the Pitzer model. The formation constant (log10β10= 2.38 ± 0.08) for MgSO4(aq) at 25°C and infinite dilution obtained in this study is in excellent agreement with the literature values. The experimental data on the solubility of gypsum (CaSO4•2H2O), at 25°C, in aqueous solutions of MgSO4 with ionic strengths up to ~11 mol•kg–1 were analyzed using models with and without considering the MgSO4(aq) species. The model incorporating MgSO4(aq) fits better to the experimental data than the model without MgSO4(aq), especially in the ionic strength range beyond ~4 mol•kg–1, demonstrating the need for incorporation of MgSO4(aq) into the model to improve the accuracy.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Environmental Management (EM)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1429714
Report Number(s):
SAND-2017-13513J; PII: 742
Journal Information:
Journal of Solution Chemistry, Vol. 47, Issue 4; ISSN 0095-9782
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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Cited By (2)

Interaction of Np( v ) with borate in alkaline, dilute-to-concentrated, NaCl and MgCl 2 solutions journal January 2020
Interaction of Np(v) with borate in alkaline, dilute-to-concentrated, NaCl and MgCl₂ solutions text January 2020

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Nuclear waste management
Pitzer model
Corrosion of Mg-based alloys
Gypsum
Degradation of cement