Dissolution dynamics of the calcite-water interface observed in situ by glancing-incidence X-ray scattering

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Glancing-incidence X-ray scattering measurements made at the National Synchrotron Light Source were used to investigate dissolution dynamics in situ at the calcite-water interface. The relation between calcite saturation state and roughness of the calcite (1014) cleavage surface as a function of time was examined during pH titrations of an initially calcite-saturated solution. Systematic variations in roughness were observed as a function of saturation state as pH was titrated to values below that of calcite saturation. Different steady-state values of roughness were evident at fixed values of {Delta}G{sub r}, and these were correlated with the extent of undersaturation. A significant increase ... continued below

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15 p.

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Sturchio, N.C. & Chiarello, R.P. June 2, 1995.

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Description

Glancing-incidence X-ray scattering measurements made at the National Synchrotron Light Source were used to investigate dissolution dynamics in situ at the calcite-water interface. The relation between calcite saturation state and roughness of the calcite (1014) cleavage surface as a function of time was examined during pH titrations of an initially calcite-saturated solution. Systematic variations in roughness were observed as a function of saturation state as pH was titrated to values below that of calcite saturation. Different steady-state values of roughness were evident at fixed values of {Delta}G{sub r}, and these were correlated with the extent of undersaturation. A significant increase in roughness begins to occur with increasing undersaturation at a {Delta}G{sub r} value of approximately {minus}2.0 kcal/mol. The dissolution rate corresponding to this increase is about 1.5 x 10{sup 7} mmol/cm {center_dot} sec. This increase in roughness is attributed to a transition in the principal rate-determining dissolution mechanism, and is consistent with both powder-reaction studies of dissolution kinetics and single-crystal dissolution studies by atomic force microscopy. These data indicate some important potential applications of GIXS in the study of mineral-water interface geochemistry.

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15 p.

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OSTI as DE97008052

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  • Other Information: PBD: 2 Jun 1995

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  • Other: DE97008052
  • Report No.: ANL/CMT/PP--86910
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/510301 | External Link
  • Office of Scientific & Technical Information Report Number: 510301
  • Archival Resource Key: ark:/67531/metadc699276

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  • June 2, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 12:16 p.m.

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Sturchio, N.C. & Chiarello, R.P. Dissolution dynamics of the calcite-water interface observed in situ by glancing-incidence X-ray scattering, report, June 2, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc699276/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.