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

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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
Issue number32
StatePublished - Sep 28 2009

All Science Journal Classification (ASJC) codes

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

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