EXPERIMENTAL STUDY OF ALUMINUM AND CALCIUM MALONATE COMPLEXATION AT 25, 35, AND 80°C
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dc.contributor.author | Fein J.B. | |
dc.contributor.author | Yane L. | |
dc.contributor.author | Jyoti A. | |
dc.contributor.author | Handa T. | |
dc.date.accessioned | 2020-11-26T08:26:24Z | |
dc.date.available | 2020-11-26T08:26:24Z | |
dc.date.issued | 1995 | |
dc.identifier | https://elibrary.ru/item.asp?id=661749 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1995, , 6, 1053-1062 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19658 | |
dc.description.abstract | The solubility of gibbsite was measured at 35 and 80°C, and the solubility of portlandite was measured at 25, 35, and 80°C, each as a function of pH and malonate concentration. The gibbsite solubility data can be satisfactorily modelled using only one aqueous Al-malonate species. The data rule out all possible Alp(OH)q(Mal)3p-q-2r)r and Alp(OH)q(HMal)3p-q-r)r stoichiometries except Al(Mal)-2 and Al(OH)2(HMal)-2, each of which provides an excellent fit to all of the experimental solubility data. If Al(Mal)-2 is the dominant species, the data constrain the value for the log of the dissociation constant of Al(Mal)-2 to be -11.3 +/- 1.0 and -14.5 +/- 0.5 at 35 and 80°C, respectively. If Al(OH)2(HMal)-2 is the dominant species, the values of its dissociation constant at 35°C and at 80°C are -27.3 +/- 1.0 and -27.6 +/- 0.5, respectively. The portlandite solubilities indicate that Ca(Mal)0 is the dominant Ca-malonate complex, with values for the log of the dissociation constant of Ca(Mal)0 of -2.4 +/- 0.3, -2.4 +/- 0.3, and -2.9 +/- 0.3, at 25, 35, and 80°C, respectively. Thermodynamic modelling, using these results, indicates that Al-malonate complexation can potentially enhance the solubility of Al-bearing minerals by up to five orders of magnitude. | |
dc.title | EXPERIMENTAL STUDY OF ALUMINUM AND CALCIUM MALONATE COMPLEXATION AT 25, 35, AND 80°C | |
dc.type | Статья |
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