Identification of the As-bearing phases in fresh volcanic Andean ashes
Fil: Bia, Gonzalo Luis.Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina.
| Main Authors: | , , , |
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| Format: | bookPart |
| Language: | eng |
| Published: |
2022
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| Online Access: | http://hdl.handle.net/11086/29757 |
| _version_ | 1801214319039348736 |
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| author | Bia, Gonzalo Luis Borgnino, Laura Gaiero, Diego M García, Maria Gabriela |
| author_facet | Bia, Gonzalo Luis Borgnino, Laura Gaiero, Diego M García, Maria Gabriela |
| author_sort | Bia, Gonzalo Luis |
| collection | Repositorio Digital Universitario |
| description | Fil: Bia, Gonzalo Luis.Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. |
| format | bookPart |
| id | rdu-unc.29757 |
| institution | Universidad Nacional de Cordoba |
| language | eng |
| publishDate | 2022 |
| record_format | dspace |
| spelling | rdu-unc.297572023-11-21T16:48:46Z Identification of the As-bearing phases in fresh volcanic Andean ashes Bia, Gonzalo Luis Borgnino, Laura Gaiero, Diego M García, Maria Gabriela Arsenic Volcanic ash Loess Fil: Bia, Gonzalo Luis.Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Fil: Bia, Gonzalo Luis. Universidad Nacional de Córdoba; Argentina. Fil: Borgnino, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Fil: Borgnino, Laura. Universidad Nacional de Córdoba; Argentina. Fil: Gaiero, Diego M. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Fil: Gaiero, Diego M. Universidad Nacional de Córdoba; Argentina. Fil: García, Maria Gabriela. Universidad Nacional de Córdoba; Argentina. Fil: García, Maria Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. The sources and dynamics of arsenic in fresh volcanic ashes collected during the eruptions of Hudson (1991) and Puyehue (2011) volcanos, have been studied. The chemical and mineralogical compositions of both volcanic ashes were analyzed by ICP/OES, XRD, and SEM-EDS. Batch experiments were conducted to evaluate the kinetics of the arsenic release under variable pH. Results indicate that the release is enhanced under both, acidic and alkaline conditions. Besides, the positive significant linear trend found between Fe and As concentrations in the leachates suggests that arsenopyrite or/and its alteration product scorodite is one important As-bearing phase present in the ash samples. This phase would be the main responsible of the As release under acidic conditions. At higher pH, two other mechanisms are involved: desorption from Fe(hydr)oxide coatings (at neutral to slightly alkaline conditions) and dissolution of both arsenopyrite and volcanic glass at pH higher than 9. Fil: Bia, Gonzalo Luis.Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Fil: Bia, Gonzalo Luis. Universidad Nacional de Córdoba; Argentina. Fil: Borgnino, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Fil: Borgnino, Laura. Universidad Nacional de Córdoba; Argentina. Fil: Gaiero, Diego M. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Fil: Gaiero, Diego M. Universidad Nacional de Córdoba; Argentina. Fil: García, Maria Gabriela. Universidad Nacional de Córdoba; Argentina. Fil: García, Maria Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina. Otras Ciencias Químicas 2022-11-23T12:38:34Z 2022-11-23T12:38:34Z 2014 bookPart 9781138001411 http://hdl.handle.net/11086/29757 eng http://hdl.handle.net/11086/20502 Attribution-NonCommercial-ShareAlike 4.0 International https://creativecommons.org/licenses/by-nc-sa/4.0/ Impreso |
| spellingShingle | Arsenic Volcanic ash Loess Bia, Gonzalo Luis Borgnino, Laura Gaiero, Diego M García, Maria Gabriela Identification of the As-bearing phases in fresh volcanic Andean ashes |
| title | Identification of the As-bearing phases in fresh volcanic Andean ashes |
| title_full | Identification of the As-bearing phases in fresh volcanic Andean ashes |
| title_fullStr | Identification of the As-bearing phases in fresh volcanic Andean ashes |
| title_full_unstemmed | Identification of the As-bearing phases in fresh volcanic Andean ashes |
| title_short | Identification of the As-bearing phases in fresh volcanic Andean ashes |
| title_sort | identification of the as bearing phases in fresh volcanic andean ashes |
| topic | Arsenic Volcanic ash Loess |
| url | http://hdl.handle.net/11086/29757 |
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