Magnesium silicate dissolution investigated by 29 Si MAS, 1 H- 29 Si CPMAS, 25 Mg QCPMG, and 1 H- 25 Mg CP QCPMG NMR

Michael C. Davis, William J. Brouwer, David J. Wesolowski, Lawrence M. Anovitz, Andrew S. Lipton, Karl Todd Mueller

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Olivine - (Mg,Fe) 2 SiO 4 - has been the subject of frequent investigation in the earth sciences because of its simple structure and rapid dissolution kinetics. Several studies have observed a preferential release of the divalent cation with respect to silicon during weathering under acidic conditions, which has been correlated to the formation of a silicon-rich leached layer. While leached layer formation has been inferred through the changing solution chemistry, a thorough spectroscopic investigation of olivine reacted under acidic conditions has not been conducted. The pure magnesium end member of the olivine series (forsterite - Mg 2 SiO 4 ) was chosen for detailed investigations in this study because paramagnetic iron hinders NMR investigations by providing an extra mode of relaxation for neighboring nuclei, causing lineshapes to become significantly broadened and unobservable in the NMR spectrum. For reacting forsterite, spectroscopic interrogations using nuclear magnetic resonance (NMR) can elucidate the changing magnesium coordination and bonding environment. In this study, we combine analysis of the changing solution chemistry with advanced NMR techniques ( 29 Si MAS, 1 H- 29 Si CP MAS, 25 Mg QCPMG, and 1 H- 25 Mg CP QCPMG NMR) to probe leached layer formation and secondary phase precipitation during the dissolution of forsterite at 150 °C.

Original languageEnglish (US)
Pages (from-to)7013-7021
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume11
Issue number32
DOIs
StatePublished - Sep 28 2009

Fingerprint

magnesium
silicates
dissolving
Dissolution
Nuclear magnetic resonance
forsterite
nuclear magnetic resonance
olivine
Silicon
Magnesium
chemistry
Earth sciences
interrogation
Divalent Cations
weathering
silicon
Weathering
Iron
benzmetanide
Florisil

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Davis, M. C., Brouwer, W. J., Wesolowski, D. J., Anovitz, L. M., Lipton, A. S., & Mueller, K. T. (2009). Magnesium silicate dissolution investigated by 29 Si MAS, 1 H- 29 Si CPMAS, 25 Mg QCPMG, and 1 H- 25 Mg CP QCPMG NMR Physical Chemistry Chemical Physics, 11(32), 7013-7021. https://doi.org/10.1039/b907494e
Davis, Michael C. ; Brouwer, William J. ; Wesolowski, David J. ; Anovitz, Lawrence M. ; Lipton, Andrew S. ; Mueller, Karl Todd. / Magnesium silicate dissolution investigated by 29 Si MAS, 1 H- 29 Si CPMAS, 25 Mg QCPMG, and 1 H- 25 Mg CP QCPMG NMR In: Physical Chemistry Chemical Physics. 2009 ; Vol. 11, No. 32. pp. 7013-7021.
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Magnesium silicate dissolution investigated by 29 Si MAS, 1 H- 29 Si CPMAS, 25 Mg QCPMG, and 1 H- 25 Mg CP QCPMG NMR . / Davis, Michael C.; Brouwer, William J.; Wesolowski, David J.; Anovitz, Lawrence M.; Lipton, Andrew S.; Mueller, Karl Todd.

In: Physical Chemistry Chemical Physics, Vol. 11, No. 32, 28.09.2009, p. 7013-7021.

Research output: Contribution to journalArticle

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