The effect of fluoride on the dissolution rates of natural glasses at pH 4 and 25°C

Wolff-Boenisch, Domenik; Gíslason, Sigurður R.; Oelkers, Eric H.

doi:10.1016/j.gca.2004.05.026

Cited by 98 publications

(55 citation statements)

References 76 publications

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“…As such, it seems likely that such metal release reactions are critical in controlling, biotite dissolution rates, consistent with the dissolution pathways of a wide variety of other multi-oxide silicates (e.g. Oelkers et al, 1994;Gautier et al, 1994;Devidal et al, 1997;Gislason and Oelkers, 2003;Wolff-Boenisch et al, 2004;Carroll and Knauss, 2005;Saldi et al, 2007).…”

Section: Implications Of Biotite Surface Chemistry For Dissolution Kimentioning

confidence: 69%

“…Furthermore, dissolution rates of a wide range of minerals can depend on the activity of aqueous metals present in solution (e.g. Oelkers et al, 1994;Gautier et al, 1994;Devidal et al, 1997;Gislason and Oelkers, 2003;Wolff-Boenisch et al, 2004;Carroll and Knauss, 2005;Saldi et al, 2007). A further motivation of this study is therefore to characterise the reactions controlling the surface chemistry of a reference phyllosilicate, biotite, to improve our understanding of the overall dissolution mechanism of this widespread family of minerals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biotite surface chemistry as a function of aqueous fluid composition

Bray

Benning

Bonneville

et al. 2014

Geochimica et Cosmochimica Acta

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Section: Implications Of Biotite Surface Chemistry For Dissolution Kimentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Biotite surface chemistry as a function of aqueous fluid composition

Bray

Benning

Bonneville

et al. 2014

Geochimica et Cosmochimica Acta

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“…The rate of glass dissolution, however, is strongly dependent on pH: relatively slow for seawater pH of ca. 8 and faster for an acidic pH <7, especially if fluorine and sulphate anions are present (Gislason and Oelkers, 2003;Flaathen et al, 2008;Wolff-Boenisch et al, 2004a). A transient pH decrease of surface seawater following ash addition could therefore potentially lead to enhanced glass dissolution.…”

Section: Influence Of Phmentioning

confidence: 99%

“…Some predictions, however, can be made from what is known about glass dissolution rates and the solubility of iron: volcanic ash typically reacts moderately to strongly acidic in contact with non-pHbuffered fresh water (Óskarsson, 1980;Jones and Gislason, 2008) but glass dissolution rates increase dramatically with decreasing pH at acidic conditions (Gislason and Oelkers, 2003). Moreover, at acidic pH, the presence of fluoride and probably sulphate significantly further increases glass dissolution rate (Wolff-Boenisch et al, 2004a;Flaathen et al, 2008). Fluoride and sulphate are both contained in the soluble salt coatings associated with volcanic ash (Delmelle et al, 2007).…”

Section: Wet and Dry Depositionmentioning

confidence: 99%

The role of airborne volcanic ash for the surface ocean biogeochemical iron-cycle: a review

et al. 2010

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Abstract. Iron is a key micronutrient for phytoplankton growth in the surface ocean. Yet the significance of volcanism for the marine biogeochemical iron-cycle is poorly constrained. Recent studies, however, suggest that offshore deposition of airborne ash from volcanic eruptions is a way to inject significant amounts of bio-available iron into the surface ocean. Volcanic ash may be transported up to several tens of kilometers high into the atmosphere during largescale eruptions and fine ash may stay aloft for days to weeks, thereby reaching even the remotest and most ironstarved oceanic regions. Scientific ocean drilling demonstrates that volcanic ash layers and dispersed ash particles are frequently found in marine sediments and that therefore volcanic ash deposition and iron-injection into the oceans took place throughout much of the Earth's history. Natural evidence and the data now available from geochemical and biological experiments and satellite techniques suggest that volcanic ash is a so far underestimated source for iron in the surface ocean, possibly of similar importance as aeolian dust. Here we summarise the development of and the knowledge in this fairly young research field. The paper Correspondence to: S. Duggen (svend duggen@skoleforeningen.de) covers a wide range of chemical and biological issues and we make recommendations for future directions in these areas. The review paper may thus be helpful to improve our understanding of the role of volcanic ash for the marine biogeochemical iron-cycle, marine primary productivity and the ocean-atmosphere exchange of CO 2 and other gases relevant for climate in the Earth's history.

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“…7). The crucial role of chlorine and fluorine in enhancing ash dissolution reactions has been emphasized previously (Delmelle et al, 2007;Wolff-Boenisch et al, 2004;Moune et al, 2007). It has been suggested that the ash dissolution is most efficient within the eruption plume possibly occurring during the first minutes of the transport dictating the surface composition of ash (Moune et al, 2006;Delmelle et al, 2007).…”

Section: Comparison With Experimental Datamentioning

confidence: 99%

Ash iron mobilization through physicochemical processing in volcanic eruption plumes: a numerical modeling approach

2015

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Abstract. It has been shown that volcanic ash fertilizes the Fe-limited areas of the surface ocean through releasing soluble iron. As ash iron is mostly insoluble upon the eruption, it is hypothesized that heterogeneous in-plume and in-cloud processing of the ash promote the iron solubilization. Direct evidences concerning such processes are, however, lacking. In this study, a 1-D numerical model is developed to simulate the physicochemical interactions of the gas-ash-aerosol in volcanic eruption plumes focusing on the iron mobilization processes at temperatures between 600 and 0 • C. Results show that sulfuric acid and water vapor condense at ∼ 150 and ∼ 50 • C on the ash surface, respectively. This liquid phase then efficiently scavenges the surrounding gases (> 95 % of HCl, 3-20 % of SO 2 and 12-62 % of HF) forming an extremely acidic coating at the ash surface. The low pH conditions of the aqueous film promote acid-mediated dissolution of the Fe-bearing phases present in the ash material. We estimate that 0.1-33 % of the total iron available at the ash surface is dissolved in the aqueous phase before the freezing point is reached. The efficiency of dissolution is controlled by the halogen content of the erupted gas as well as the mineralogy of the iron at ash surface: elevated halogen concentrations and presence of Fe 2+ -carrying phases lead to the highest dissolution efficiency. Findings of this study are in agreement with the data obtained through leaching experiments.

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The effect of fluoride on the dissolution rates of natural glasses at pH 4 and 25°C

Cited by 98 publications

References 76 publications

Biotite surface chemistry as a function of aqueous fluid composition

Biotite surface chemistry as a function of aqueous fluid composition

The role of airborne volcanic ash for the surface ocean biogeochemical iron-cycle: a review

Ash iron mobilization through physicochemical processing in volcanic eruption plumes: a numerical modeling approach

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