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Title: Experimental determination of lead carbonate solubility at high ionic strengths: A Pitzer model description

In this article, solubility measurements of lead carbonate, PbCO3(cr), cerussite, as a function of total ionic strengths are conducted in the mixtures of NaCl and NaHCO3 up to I = 1.2 mol•kg–1 and in the mixtures of NaHCO3 and Na2CO3 up to I = 5.2 mol•kg–1, at room temperature (22.5 ± 0.5 °C). The solubility constant (log Ksp) for cerussite, PbCO3(cr) = Pb2+ + CO32- was determined as –13.76 ± 0.15 (2σ) with a set of Pitzer parameters describing the specific interactions of PbCO3(aq), Pb(CO3)22-, and Pb(CO3)Cl with the bulk-supporting electrolytes, based on the Pitzer model. The model developed in this work can reproduce the experimental results including model-independent solubility values from the literature over a wide range of ionic strengths with satisfactory accuracy. The model is expected to find applications in numerous fields, including the accurate description of chemical behavior of lead in geological repositories, the modeling of formation of oxidized Pb–Zn ore deposits, and the environmental remediation of lead contamination.
Authors:
 [1]
  1. Sandia National Labs. (SNL), Carlsbad, NM (United States)
Publication Date:
OSTI Identifier:
1235353
Report Number(s):
SAND--2015-0604J
Journal ID: ISSN 0026-9247; 562486
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Monatshefte fuer Chemie
Additional Journal Information:
Journal Volume: 146; Journal Issue: 9; Journal ID: ISSN 0026-9247
Publisher:
Springer
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Environmental Management (EM)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY lead contamination remediation; cerussite; oxidized lead-zinc ore deposits; solution chemistry; nuclear waste management; waste isolation pilot plant