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New Insights into Calcite Dissolution Mechanisms under Water, Proton, or Carbonic Acid-Dominated Conditions.
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- Author(s): Kim KT;Kim KT; Henkelman G; Henkelman G; Katz LE; Katz LE; Werth CJ; Werth CJ
- Source:
Environmental science & technology [Environ Sci Technol] 2024 Jul 02; Vol. 58 (26), pp. 11331-11341. Date of Electronic Publication: 2024 Jun 22.- Publication Type:
Journal Article- Language:
English - Source:
- Additional Information
- Source: Publisher: American Chemical Society Country of Publication: United States NLM ID: 0213155 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5851 (Electronic) Linking ISSN: 0013936X NLM ISO Abbreviation: Environ Sci Technol Subsets: MEDLINE
- Publication Information: Publication: Washington DC : American Chemical Society
Original Publication: Easton, Pa. : American Chemical Society, c1967- - Subject Terms:
- Abstract: Carbonate minerals are ubiquitous in nature, and their dissolution impacts many environmentally relevant processes including preferential flow during geological carbon sequestration, pH buffering with climate-change induced ocean acidification, and organic carbon bioavailability in melting permafrost. In this study, we advance the atomic level understanding of calcite dissolution mechanisms to improve our ability to predict this complex process. We performed high pressure and temperature (1300 psi and 50 °C) batch experiments to measure transient dissolution of freshly cleaved calcite under H
2 O, H + , and H2 CO3 -dominated conditions, without and with an inhibitory anionic surfactant present. Before and after dissolution experiments, we measured dissolution etch-pit geometries using laser profilometry, and we used density functional theory to investigate relative adsorption energies of competing species that affect dissolution. Our results support the hypothesis that calcite dissolution is controlled by the ability of H2 O to preferentially adsorb to surface Ca atoms over competing species, even when dissolution is dominated by H + or H2 CO3 . More importantly, we identify for the first time that adsorbed H + enhances the role of water by weakening surface Ca-O bonds. We also identify that H2 CO3 undergoes dissociative adsorption resulting in adsorbed HCO3 - and H + . Adsorbed HCO3 - that competes with H2 O for Ca acute edge sites inhibits dissolution, while adsorbed H + at the neighboring surface of CO3 enhances dissolution. The net effect of the dissociative adsorption of H2 CO3 is enhanced dissolution. These results will impact future efforts to more accurately model the impact of solutes in complex water matrices on carbonate mineral dissolution. - Contributed Indexing: Keywords: HPHT; anionic surfactant; calcite dissolution; density functional theory; dissolution inhibition; laser profilometry
- Accession Number: H0G9379FGK (Calcium Carbonate)
463-79-6 (Carbonic Acid)
0 (Protons)
059QF0KO0R (Water) - Publication Date: Date Created: 20240622 Date Completed: 20240702 Latest Revision: 20240702
- Publication Date: 20240702
- Accession Number: 10.1021/acs.est.4c00162
- Accession Number: 38907708
- Source:
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