KINETIC ASPECTS OF BASALTIC GLASS DISSOLUTION AT 90OC: ROLE OF AQUEOUS SILICON AND ALUMINIUM
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dc.contributor.author | Daux V. | |
dc.contributor.author | Guy C. | |
dc.contributor.author | Advocat T. | |
dc.contributor.author | Crovisier J.L. | |
dc.contributor.author | Stille P. | |
dc.date.accessioned | 2020-12-14T08:35:35Z | |
dc.date.available | 2020-12-14T08:35:35Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=263279 | |
dc.identifier.citation | Chemical Geology, 1997, , 1, 109-126 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20756 | |
dc.description.abstract | Steady-state dissolution rates of a synthetic basaltic glass were measured in an open-system mixed flow reactor as a function of solution composition at a temperature of 90°C and over the pH range 7.8 to 8.3. The dissolution is a two-step process. The first of these steps involves the release of the cation modifier elements leading to the formation of a hydrated surface gel (HBG) of which the solubility controls the overall dissolution reaction. The glass steady-state dissolution rates were found to be independent of aqueous aluminium and silicium concentration but to depend on the chemical affinity for the overall hydrolysis reaction. The glass is a rapidly reacting solid, whose dissolution induces a dramatic change in solution concentration, which results readily in small chemical affinities for the dissolution reaction. Consequently, conditions of great undersaturation have not been investigated (affinity max. 9.8 kJ/mol). However, our results strongly suggest that the dissolution rates are controlled by the decomposition of a stoichiometric silico-aluminous surface precursor. The variation of the steady-state dissolution rates can be described using a simple expression based on the concept that the precursor is formed by the simple absorption of reactants: R (mol cm-2 s-1) = 3 x 10-10 (OH-)0.39 (1 - Q/8.2 x 10-5), where Q, the ion activity quotient is equal to: Q = (H4SiO4) (Al(OH)-4)0.36 (Fe(OH)3)0.18 (OH-)-0.36. | |
dc.subject | KINETIC | |
dc.subject | GLASS | |
dc.subject | CHEMICAL AFFINITY | |
dc.subject | DISSOLUTION | |
dc.title | KINETIC ASPECTS OF BASALTIC GLASS DISSOLUTION AT 90OC: ROLE OF AQUEOUS SILICON AND ALUMINIUM | |
dc.type | Статья |
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