Mechanism for the dissolution of olivine series minerals in acidic solutions

Liu, Y.

doi:10.2138/am.2006.2077

Cited by 54 publications

(33 citation statements)

References 29 publications

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“…There has been much discussion in the literature regarding the mechanisms of silicate mineral weathering e.g. Schott and Berner (1983); Casey and Westrich (1992) and Liu et al (2006).…”

Section: R W Saunders Et Al: Interactions Of Meteoric Smoke Particmentioning

confidence: 99%

Interactions of meteoric smoke particles with sulphuric acid in the Earth's stratosphere

et al. 2012

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Abstract. Nano-sized meteoric smoke particles (MSPs) with iron-magnesium silicate compositions, formed in the upper mesosphere as a result of meteoric ablation, may remove sulphuric acid from the gas-phase above 40 km and may also affect the composition and behaviour of supercooled H 2 SO 4 -H 2 O droplets in the global stratospheric aerosol (Junge) layer.This study describes a time-resolved spectroscopic analysis of the evolution of the ferric (Fe 3+ ) ion originating from amorphous ferrous (Fe 2+ )-based silicate powders dissolved in varying Wt % sulphuric acid (30-75 %) solutions over a temperature range of 223-295 K. Complete dissolution of the particles was observed under all conditions. The first-order rate coefficient for dissolution decreases at higher Wt % and lower temperature, which is consistent with the increased solution viscosity limiting diffusion of H 2 SO 4 to the particle surfaces. Dissolution under stratospheric conditions should take less than a week, and is much faster than the dissolution of crystalline Fe 2+ compounds.The chemistry climate model UMSLIMCAT (based on the UKMO Unified Model) was then used to study the transport of MSPs through the middle atmosphere. A series of model experiments were performed with different uptake coefficients. Setting the concentration of 1.5 nm radius MSPs at 80 km to 3000 cm −3 (based on rocket-borne charged particle measurements), the model matches the reported Wt % Fe values of 0.5-1.0 in Junge layer sulphate particles, and the MSP optical extinction between 40 and 75 km measured by a satellite-borne spectrometer, if the global meteoric input rate is about 20 tonnes per day. The model indicates that an uptake coefficient ≥0.01 is required to account for the observed two orders of magnitude depletion of H 2 SO 4 vapour above 40 km.

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“…There has been much discussion in the literature regarding the mechanisms of silicate mineral weathering e.g. Schott and Berner (1983); Casey and Westrich (1992) and Liu et al (2006).…”

Section: R W Saunders Et Al: Interactions Of Meteoric Smoke Particmentioning

confidence: 99%

Interactions of meteoric smoke particles with sulphuric acid in the Earth's stratosphere

et al. 2012

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show abstract

“…1016/j.gca.2008.07.002 transition state theory (TST) (Eyring, 1935;Lasaga, 1998) and the Arrhenius equation to incorporate measured effects of pH, temperature, surface speciation, and deviation from equilibrium (e.g., reaction affinity). A typical approach has been to synthesize data from the literature, possibly use a surface complexation model (SCM) to describe the speciation of reactive sites, assume there are at most a few rate-limiting steps in the dissolution process, and fit to the data a rate law whose form is dictated by the assumed rate-limiting steps (Dove and Crerar, 1990;Dove, 1992Dove, , 1994Dove, , 1995Dove, , 1999Dove and Elston, 1992;Oelkers et al, 1994;Rosso and Rimstidt, 2000;Oelkers, 2001;Liu et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Reaction pathways for quartz dissolution determined by statistical and graphical analysis of macroscopic experimental data

Bickmore

Wheeler

Bates

et al. 2008

Geochimica et Cosmochimica Acta

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“…It was suggested that the rate controlling surface complex in leached olivines is the formation of the Si dimer. In contrast, the formation of these thin surface layers is usually thought to involve an initial exchange of Mg 2+ in M2 for 2H + from solution (Schott and Berner, 1985;Rosso and Rimstidt, 2000;Liu et al, 2006) after adsorption and reaction of an absorbed hydronium ion (Rosso and Rimstidt, 2000;Liu et al, 2006). There are only a few XPS studies of pyroxene leaching (e.g., Schott et al, 1981;Schott and Berner, 1985).…”

Section: Introductionmentioning

confidence: 99%

Characterization of leached layers on olivine and pyroxenes using high-resolution XPS and density functional calculations

Zakaznova-Herzog

Nesbitt

Bancroft

et al. 2008

Geochimica et Cosmochimica Acta

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Mechanism for the dissolution of olivine series minerals in acidic solutions

Cited by 54 publications

References 29 publications

Interactions of meteoric smoke particles with sulphuric acid in the Earth's stratosphere

Interactions of meteoric smoke particles with sulphuric acid in the Earth's stratosphere

Reaction pathways for quartz dissolution determined by statistical and graphical analysis of macroscopic experimental data

Characterization of leached layers on olivine and pyroxenes using high-resolution XPS and density functional calculations

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