Behavior of bromide ions during the formation of calcium carbonate |
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| Institution: | 1. Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, CDMX, Mexico;2. Departamento de Geología Regional, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, CDMX, Mexico;1. Laboratory of Radiochemistry, Department of Chemistry, P.O. Box 55, 00014 University of Helsinki, Finland;2. VTT Technical Research Centre of Finland, P.O. Box 1000, 02044, VTT, Finland;1. National Cooperative for the Disposal of Radioactive Waste (NAGRA), Hardstrasse 73, 5430, Wettingen, Switzerland;2. Applied Physics Lab, University of Washington, Seattle, WA, 98105, USA;3. School of Freshwater Sciences, University of Wisconsin-Milwaukee, WI, 53201, USA;4. Institute of Geological Sciences, University of Bern, 3012, Bern, Switzerland;5. Paul Scherrer Institut, 5232, Villigen, PSI, Switzerland;6. Swisstopo, Route de la Gare 63, 2882, St-Ursanne, Switzerland;7. Arcadis, Ifangstrasse 11, 8952, Schlieren, Switzerland;8. FANC-AFCN, 1000, Brussels, Belgium;1. BRGM, BP36009, 45060 Orléans Cedex 2, France;2. Andra, Meuse/Haute-Marne Underground Research Laboratory (URL), RD 960, 55290 Bure, France;3. Andra, 1-7, Rue Jean-Monnet, 92298 Châtenay-Malabry Cedex, France;4. Karlsruhe Institute of Technology (KIT) – Campus North, Institut für Nukleare Entsorgung (INE), Post Box 3640, 76021 Karlsruhe, Germany;5. Institut für Geowissenschaften, Johannes Gutenberg University, Mainz D-55099, Germany;6. Hydroisotop GmbH, Woelkestr. 9, D-85301 Schweitenkirchen, Germany;7. Institute of Geological Sciences, Department of Earth Sciences, Freie Universität Berlin, Berlin, Germany;1. CIEMAT, Department of Environment, Av. Complutense, 40, 28040 Madrid, Spain;2. Amphos21 Consulting S.L., Pg. Garcia-Fària 49, 08019 Barcelona, Spain;3. Andra, R&D Division, 1-7 rue Jean Monnet, 92298 Châtenay-Malabry, France |
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| Abstract: | Coprecipitation of bromide ions with calcium carbonate, formed from a calcium bicarbonate solution containing bromide ions, and the influence of bromide ions in a parent solution on the crystal form of the calcium carbonate were studied experimentally. The following results were obtained: the coprecipitation is affected by the crystal form of the calcium carbonate and the concentration of sodium chloride dissolved in a parent solution. The bromide ions are more easily coprecipitated with aragonite than with calcite. The amount of bromide ions coprecipitated with aragonite decreases significantly with increasing concentration of sodium chloride in a parent solution. The presence of bromide ions in a parent solution has a slight influence on the crystal form of calcium carbonate to favor calcite formation and to inhibit aragonite formation.The role of marine carbonate sediments in the removal of bromide ions from sea water is discussed briefly. |
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