Forsteritic olivine: effect of crystallographic direction on dissolution kinetics

Awad, Ahmed M.; Groos, A. F. Koster van; Guggenheim, Stephen

doi:10.1016/s0016-7037(99)00442-1

Cited by 82 publications

(57 citation statements)

References 14 publications

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“…Considering the similar width and composition of illite crystals in the starting and bioreduced samples (Figures 8 and 9), the platelike illite crystals in the bioreduced sample could have been a product of along-layer dissolution of those needlelike crystals observed in the starting material. It is well-established that the silicate mineral dissolution rate is different, depending on crystallographic orientation, and such a differential dissolution can have a similar effect as crystal growth producing euhedral crystals (26).…”

Section: Discussionmentioning

confidence: 99%

Microbial Reduction of Structural Fe(III) in Illite and Goethite

Dong

Kukkadapu

Fredrickson

et al. 2003

Environ. Sci. Technol.

134

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Microbial reduction of Fe(III) in illite was studied to evaluate the possibility of microbial utilization of Fe(III) in sedimentary clays and to determine the effects of bioreduction on clay composition and structure. A subsurface bacterium (Shewanella putrefaciens CN32) and illite separates (<0.2 µm) from St. Peter Formation sandstone in Ogle County, IL, were used in laboratory experiments. Illite suspensions buffered at pH 7 with bicarbonate were inoculated with CN32 and provided with H 2 as an electron donor. In selected treatments, anthraquinone-2,6-disulfonate (AQDS), was included as an electron shuttle to facilitate the bioreduction. Fe(II) production in inoculated treatments was determined by extraction with 0.5 N HCl and compared to uninoculated controls to establish the extent of biological reduction. The resulting solids were characterized by Mo ¨ssbauer spectroscopy and scanning and transmission electron microscopy (SEM and TEM). The characterization of the starting illite material revealed that it contained a minor component of goethite (R-FeOOH) in addition to fibrous illite. The starting material (both goethite and illite) contained 6% (w/ w) total Fe, and 82% of the total Fe was Fe(III). Approximately 30% of total Fe was associated with goethite. At the end of a 30-day incubation, residual goethite and illite remained. The extent of reduction was much greater in the presence of AQDS (25%) than in its absence (0%). Modeling of Mo ¨ssbauer spectra of the bioreduced material indicated that both goethite and illite were reduced but to a different extent. Additionally, TEM evidence suggested that there was a dramatic change in illite morphology upon bioreduction from fibrous needles to plates. The ability of bacteria to utilize Fe(III) in illite has important implications for microbial functions and survival mechanisms, as well as many geological processes, in the subsurface.

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Section: Discussionmentioning

confidence: 99%

Microbial Reduction of Structural Fe(III) in Illite and Goethite

Dong

Kukkadapu

Fredrickson

et al. 2003

Environ. Sci. Technol.

134

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“…Thus, the silica texture generated during the reaction of olivine is mostly determined by the dissolution rate of olivine. Olivine dissolution has been widely studied [4,6,[17][18][19][20][21][22][23], but only Jonckbloedt [6] studied it in the olivine nano-silica conditions. He stated that the dissolution of olivine in these conditions is controlled by surface reactions and that it depends on the surface area of olivine, hydrogen ion activity and temperature [6].…”

Section: Texture Of the Olivine Nano-silicamentioning

confidence: 99%

The properties of amorphous nano-silica synthesized by the dissolution of olivine

Lázaro

Brouwers

Quercia

et al. 2012

Chemical Engineering Journal

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“…Giammar et al, 2005;Oelkers and Schott, 2005;Bearat et al, 2006;Matter et al, 2007;Oelkers et al, 2008;Dufaud et al, 2009;Prigiobbe et al, 2009;Matter and Kelemen, 2009;King et al, 2010;Daval et al, 2011;Guyot et al, 2011;Broecker, 2012;Kohler et al, 2013;Gislason and Oelkers, 2014;Sissmann et al, 2014). This interest has led to a large number of studies aimed at characterizing forsterite dissolution behavior and rates at various fluid compositions and temperatures (Luce et al, 1972;Sanemasa et al, 1972, Grandstaff, 1978, 1986, Murphy and Helgeson, 1987, 1989Blum andLasaga, 1988, Banfield et al, 1990;Walther, 1991, 1992;Casey and Westrich, 1992, Awad et al, 2000, Chen and Brantley, 2000, Rosso and Rimstidt, 2000, Pokrovsky and Schott, 2000a, 2000b, Oelkers, 2001b, Giammar et al, 2005, Hänchen et al, 2006, Olsen and Rimstidt, 2008Davis et al, 2009;Rimstidt et al, 2012;Olsson et al, 2012;Plümper et al, 2012;Wang and Giammar, 2012;Garcia et al, 2013;<...>…”

Section: Introductionmentioning

confidence: 99%