Journal article

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 adherent overgrowths are encouraged by a lattice matching between the cleavage (211) plane of calcite and the (010) plane of CaSO4andmiddot;2H2O.

Publication status:: Published

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APA Style

Booth, J., Hong, Q., Compton, R., Prout, K., & Payne, R. (1997). Gypsum Overgrowths Passivate Calcite to Acid Attack. Journal of Colloid and Interface Science, 192(1), 207–214.

MLA Style

Booth, J., et al. “Gypsum Overgrowths Passivate Calcite to Acid Attack.” Journal of Colloid and Interface Science, vol. 192, no. 1, 1997, pp. 207–14.

Chicago Style

Booth, J, Q Hong, R Compton, K Prout, and R Payne. 1997. “Gypsum Overgrowths Passivate Calcite to Acid Attack.” Journal of Colloid and Interface Science 192 (1): 207–14.
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Publisher copy:: 10.1006/jcis.1997.4978

Authors

+ Booth, J More by this author

Role:: Author

+ Hong, Q More by this author

Role:: Author

+ Compton, R More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Chemistry
Sub department:: Physical & Theoretical Chem
Role:: Author

+ Prout, K More by this author

Role:: Author

+ Payne, R More by this author

Role:: Author

Journal:: Journal of colloid and interface science More from this journal
Volume:: 192
Issue:: 1
Pages:: 207-214
Publication date:: 1997-08-01
DOI:: 10.1006/jcis.1997.4978
EISSN:: 1095-7103
ISSN:: 0021-9797

Language:: English
Keywords:: calcite dissolution

atomic force microscopy

calcium sulfate

calcium carbonate

gypsum crystallization

channel flow cell
UUID:: uuid:331c418e-e930-48d1-9c87-32eac1006538
Local pid:: pubs:36082
Source identifiers:: 36082
Deposit date:: 2012-12-19

Terms of use

Copyright date:: 1997

Licence:: Terms and Conditions of Use for Oxford University Research Archive

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