EXPERIMENTAL STUDY OF LA(OH)3 AND GD(OH)3 SOLUBILITIES (25 TO 150°C), AND LA-ACETATE COMPLEXING (25 TO 80°C)
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dc.contributor.author | Deberdt S. | |
dc.contributor.author | Castet S. | |
dc.contributor.author | Dandurand J.L. | |
dc.contributor.author | Harrichoury J.C. | |
dc.contributor.author | Louiset I. | |
dc.date.accessioned | 2020-12-29T05:09:45Z | |
dc.date.available | 2020-12-29T05:09:45Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=76307 | |
dc.identifier.citation | Chemical Geology, 1998, , 1, 349-372 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21624 | |
dc.description.abstract | The solubilities of pure synthetic La and Gd hydroxides were measured in aqueous solutions over a wide range of pH (5-9.5) and temperature (40-150°C). The regression of these data is used to determine the first dissociation constant (KS0*) of the minerals as a function of temperature. The logarithm of these constants is found to be linearly related to the reciprocal temperature, which allows their reliable extrapolation to 25°C. In the range of temperature and pH investigated, only the REE3+ ion (where REE denotes La or Gd) is present in solution, indicating that the first hydrolysis constants proposed by , which are generally admitted, are overestimated.The complexation of La with acetate ion (AcO-) was studied by both solubility and potentiometric measurements. Potentiometric titrations are interpreted in terms of the formation of two complexes: LaAcO2+ and La(AcO)2+, and are used to generate the corresponding stability constants in the temperature range 25-80°C. These data allow accurate description of the La(OH)3 solubility increase, evidenced in acetate-bearing solutions. | |
dc.subject | RARE EARTH ELEMENTS | |
dc.subject | LANTHANUM | |
dc.subject | GADOLINIUM | |
dc.subject | HYDROLYSIS | |
dc.subject | LA-ACETATE COMPLEXES | |
dc.subject | SOLUBILITY | |
dc.subject | POTENTIOMETRY | |
dc.subject | THERMODYNAMIC PROPERTIES | |
dc.title | EXPERIMENTAL STUDY OF LA(OH)3 AND GD(OH)3 SOLUBILITIES (25 TO 150°C), AND LA-ACETATE COMPLEXING (25 TO 80°C) | |
dc.type | Статья |
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