SPECTROPHOTOMETRIC DETERMINATION OF THE STABILITY OF THALLIUM (I) CHLORIDE COMPLEXES IN AQUEOUS SOLUTION UP TO 200°C
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dc.contributor.author | Bebie J. | |
dc.contributor.author | Seward T.M. | |
dc.contributor.author | Hovey J.K. | |
dc.date.accessioned | 2020-12-27T12:13:44Z | |
dc.date.available | 2020-12-27T12:13:44Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=2736 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1998, , 9, 1643-1651 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21442 | |
dc.description.abstract | The aim of this study has been to gain insight into the aqueous chemistry of thallium at elevated temperatures and pressures as a first step towards trying to understand the association of Tl with Au, As, and Sb, which is often found in both fossil and active hydrothermal systems. The complexing of Tl+ with chloride ligands was studied spectrophotometrically on solutions containing 0.20 mmol/dm3 Tl, 1.0 mmol/dm3 HCl and varying NaCl concentrations up to 3.00 mol/dm3. The deconvolution of the spectra and computation of the equilibrium formation constants were performed using a nonlinear least squares routine. The scheme which best fitted the data at 25°C contained the species, Tl+, TlCl°, TlCl2−, and with less certainty TlCl43−. With increasing temperature to 200°C, increasing proportions of Tl are present as the free aquated Tl+ ion and the uncharged TlCl°. The formation of TlCl° with increasing temperature is associated with increasingly endothermic enthalpies and by large positive entropies. In ore-forming fluids at T ≥ 200°C, the dominant thallium(I) chloride complex will be the neutral species, TlCl°. | |
dc.title | SPECTROPHOTOMETRIC DETERMINATION OF THE STABILITY OF THALLIUM (I) CHLORIDE COMPLEXES IN AQUEOUS SOLUTION UP TO 200°C | |
dc.type | Статья |
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