Preparation and solubility of northupite from brine and its adsorption properties for Cu(II) and Cd(II) in seawater

V. Vančina, M. Plavšić, H. Bilinski, M. Branica, Frank J. Millero

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The mineral northupite Na3Mg(CO3)2Cl was synthesized from a solar Adriatic seawater brine pond to which Na2CO3 was added at 373°K. The precipitated northupite had a surface area (P) of 6.0 ± 0.4 m2g-1, and the thermodynamic solubility product was estimated to be log K Na3Mg(CO3)2Cl = -4.8 ± 0.3 at 25°C. This value was used to calculate the interfacial energy (σ = 50 erg cm-2) for the homogeneous nucleation of northupite. The solubility constant determined in this study has been used to examine the saturation state of Mahega Lake and Lake Katwe (Uganda). The waters from Lake Katwe were found to be supersaturated with respect to northupite. The adsorption of Cu and Cd onto northupite particles was studied in seawater. Both metals are strongly adsorbed. Adsorption constants and the specific area of northupite occupied by Cd and Cu using Langmuir adsorption isotherms and equilibrium constants for surface complex formation have been determined.

Original languageEnglish (US)
Pages (from-to)1329-1336
Number of pages8
JournalGeochimica et Cosmochimica Acta
Volume50
Issue number7
DOIs
StatePublished - Jul 1986

ASJC Scopus subject areas

  • Geochemistry and Petrology

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