THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS
The effects of the dianions (A2-) of d-, I- and meso-tartaric acids on the dissolution reaction which takes place between calcite and the corresponding monoanions (HA-) has been investigated: (a) by using channel-electrode shielding measurements and (b) through the characterization of the resulting...
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| Formato: | Journal article |
| Idioma: | English |
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1990
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| _version_ | 1826305893236473856 |
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| author | Barwise, A Compton, R Unwin, P |
| author_facet | Barwise, A Compton, R Unwin, P |
| author_sort | Barwise, A |
| collection | OXFORD |
| description | The effects of the dianions (A2-) of d-, I- and meso-tartaric acids on the dissolution reaction which takes place between calcite and the corresponding monoanions (HA-) has been investigated: (a) by using channel-electrode shielding measurements and (b) through the characterization of the resulting dissolution etch-pit morphologies. For the d- and I-tartaric acid system, under conditions where A2- is present at a concentration of 20 × 10-3 mol dm-3, dissolution is found to be described by the following rate law: jCa2+ = 0.01 cm s-1 [HA-]0 where [HA-]0 is the concentration (mol dm-3) of HA- at the calcite/water interface and jCa2+ is in mol s-1 cm-2. This demonstrates partial inhibition of the dissolution reaction as compared to the rate of dissolution in mineral acids. This is attributed to the adsorption of A2-. The shape of the etch pits resulting from treatment of calcite with A2-/HA- was used to infer the likely adsorption sites for the dianion. In the meso-tartaric acid system, much stronger inhibition is found and the rate of dissolution is strongly dependent on the concentration of A2- present, the rate law being given by: jCa2+ = 0.04 cm s-1 [HA-]0/1 + K[A2-] where K = 1.4 × 103 dm3 mol-1. Etch-pit morphologies indicated inhibition of both the lateral dissolution and the etch-pit nucleation process at dislocations on the calcite surface. |
| first_indexed | 2024-03-07T06:39:44Z |
| format | Journal article |
| id | oxford-uuid:f8d8177c-2ce7-4abd-aec5-fe74ce7fe2fb |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:39:44Z |
| publishDate | 1990 |
| record_format | dspace |
| spelling | oxford-uuid:f8d8177c-2ce7-4abd-aec5-fe74ce7fe2fb2022-03-27T12:53:39ZTHE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDSJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f8d8177c-2ce7-4abd-aec5-fe74ce7fe2fbEnglishSymplectic Elements at Oxford1990Barwise, ACompton, RUnwin, PThe effects of the dianions (A2-) of d-, I- and meso-tartaric acids on the dissolution reaction which takes place between calcite and the corresponding monoanions (HA-) has been investigated: (a) by using channel-electrode shielding measurements and (b) through the characterization of the resulting dissolution etch-pit morphologies. For the d- and I-tartaric acid system, under conditions where A2- is present at a concentration of 20 × 10-3 mol dm-3, dissolution is found to be described by the following rate law: jCa2+ = 0.01 cm s-1 [HA-]0 where [HA-]0 is the concentration (mol dm-3) of HA- at the calcite/water interface and jCa2+ is in mol s-1 cm-2. This demonstrates partial inhibition of the dissolution reaction as compared to the rate of dissolution in mineral acids. This is attributed to the adsorption of A2-. The shape of the etch pits resulting from treatment of calcite with A2-/HA- was used to infer the likely adsorption sites for the dianion. In the meso-tartaric acid system, much stronger inhibition is found and the rate of dissolution is strongly dependent on the concentration of A2- present, the rate law being given by: jCa2+ = 0.04 cm s-1 [HA-]0/1 + K[A2-] where K = 1.4 × 103 dm3 mol-1. Etch-pit morphologies indicated inhibition of both the lateral dissolution and the etch-pit nucleation process at dislocations on the calcite surface. |
| spellingShingle | Barwise, A Compton, R Unwin, P THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS |
| title | THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS |
| title_full | THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS |
| title_fullStr | THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS |
| title_full_unstemmed | THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS |
| title_short | THE EFFECT OF CARBOXYLIC-ACIDS ON THE DISSOLUTION OF CALCITE IN AQUEOUS-SOLUTION .2. D-TARTARIC,I-TARTARIC AND MESO-TARTARIC ACIDS |
| title_sort | effect of carboxylic acids on the dissolution of calcite in aqueous solution 2 d tartaric i tartaric and meso tartaric acids |
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