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Gypsum Overgrowths Passivate Calcite to Acid Attack

Abstract:

The dissolution of calcite (CaCO3) in aqueous solution at pH below ca. 5-6 is known to proceed via the direct reaction of protons at the solid surface. However, exposure of the mineral to sulfuric acid is shown to lead to the rapid formation of an overlayer of calcium sulfate (gypsum) which completely passivates the surface against further reaction and dissolution. The overlayer is nucleated instantaneously on CaCO3 surfaces. Scanning electron and atomic force microscopy show that strongly ad...

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Publication status:
Published

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Publisher copy:
10.1006/jcis.1997.4978

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Institution:
University of Oxford
Department:
Oxford, MPLS, Chemistry, Physical and Theoretical Chem
Journal:
Journal of colloid and interface science
Volume:
192
Issue:
1
Pages:
207-214
Publication date:
1997-08-05
DOI:
EISSN:
1095-7103
ISSN:
0021-9797
URN:
uuid:331c418e-e930-48d1-9c87-32eac1006538
Source identifiers:
36082
Local pid:
pubs:36082

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