Effects of Synechococcus sp. cyanobacteria inert biomass on olivine dissolution: Implications for the application of enhanced weathering methods

Weber, Sebastian; Martinez, Raul E.

doi:10.1016/j.apgeochem.2017.06.011

Cited by 6 publications

(3 citation statements)

References 77 publications

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“…A significant number of studies have aimed to determine the effect of biomass on forsterite dissolution rates. Webber and Martinez (2017) reported that the presence of inactive Synechococcus cyanobacteria had no measurable effect on the dissolution rates of Aheim forsterite. In contrast to inactive bacteria, some studies have reported that active microbes lower substantially the dissolution rates of forsterite.…”

Section: The Effect Of the Presence Of Microbial Speciesmentioning

confidence: 99%

Olivine dissolution rates: A critical review

Declercq²,

et al. 2018

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The dissolution rates of olivine have been considered by a plethora of studies in part due to its potential to aid in carbon storage and its ease in obtaining pure samples for laboratory experiments. Due to the relative simplicity of its dissolution mechanism, most of these studies provide mutually consistent results such that a comparison of their rates can provide insight into the reactivity of silicate minerals as a whole. Olivine dissolution is controlled by the breaking of octahedral M 2+-oxygen bonds at or near the surface, liberating adjoining SiO4 4tetrahedra to the aqueous fluid. Aqueous species that adsorb to these bonds apparently accelerate their destruction. For example, the absorption of H + , H2O and, at some conditions, selected aqueous organic species will increase olivine dissolution rates. Nevertheless, other factors can slow olivine dissolution rates. Notably, olivine dissolution rates are slowed by lowering the surface area exposed to the reactive aqueous fluid, by for example the presence and/or growth on these surfaces of either microbes or secondary phases. The degree to which secondary phases decelerate rates

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Section: The Effect Of the Presence Of Microbial Speciesmentioning

confidence: 99%

Olivine dissolution rates: A critical review

Declercq²,

et al. 2018

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“…These factors make research on the dissolution rate of olivine important for understanding the natural carbon cycle as well as the feasibility of CO 2 sequestration techniques based on accelerated silicate mineral dissolution (e.g., Hartmann et al., ; Köhler, Hartmann, & Wolf‐Gladrow, ; Montserrat et al., ; Power et al., ; Renforth, Pogge von Strandmann, & Henderson, ; Shirokova et al., ; Weber & Martinez, ). Here, we explore the kinetics and mechanism of biotic Fe‐bearing silicate mineral dissolution using olivine and deferoxamine B (N′‐{5‐[Acetyl(hydroxy)amino]pentyl}‐N‐[5‐({4‐[(5‐aminopentyl)(hydroxy)amino]‐4‐oxobutanoyl}amino)pentyl]‐N‐hydroxysuccinamide) as a model mineral and ligand, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…These factors make research on the dissolution rate of olivine important for understanding the natural carbon cycle as well as the feasibility of CO 2 sequestration techniques based on accelerated silicate mineral dissolution (e.g., Hartmann et al, 2013;Köhler, Hartmann, & Wolf-Gladrow, 2010;Montserrat et al, 2017;Power et al, 2011;Renforth, Pogge von Strandmann, & Henderson, 2015;Shirokova et al, 2012;Weber & Martinez, 2017). Here, we explore the kinetics and mechanism of biotic Fe-bearing silicate mineral dis- While laboratory mineral dissolution experiments with purified microbial ligands provide insights into the potential effects of microbial activity on mineral dissolution rates, extrapolating experimental results to natural systems is not straightforward.…”

Section: Introductionmentioning

confidence: 99%

The kinetics of siderophore‐mediated olivine dissolution

et al. 2019

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Silicate minerals represent an important reservoir of nutrients at Earth's surface and a source of alkalinity that modulates long‐term geochemical cycles. Due to the slow kinetics of primary silicate mineral dissolution and the potential for nutrient immobilization by secondary mineral precipitation, the bioavailability of many silicate‐bound nutrients may be limited by the ability of micro‐organisms to actively scavenge these nutrients via redox alteration and/or organic ligand production. In this study, we use targeted laboratory experiments with olivine and the siderophore deferoxamine B to explore how microbial ligands affect nutrient (Fe) release and the overall rate of mineral dissolution. Our results show that olivine dissolution rates are accelerated in the presence of micromolar concentrations of deferoxamine B. Based on the non‐linear decrease in rates with time and formation of a Fe3+‐ligand complex, we attribute this acceleration in dissolution rates to the removal of an oxidized surface coating that forms during the dissolution of olivine at circum‐neutral pH in the presence of O2 and the absence of organic ligands. While increases in dissolution rates are observed with micromolar concentrations of siderophores, it remains unclear whether such conditions could be realized in natural environments due to the strong physiological control on microbial siderophore production. So, to contextualize our experimental results, we also developed a feedback model, which considers how microbial physiology and ligand‐promoted mineral dissolution kinetics interact to control the extent of biotic enhancement of dissolution rates expected for different environments. The model predicts that physiological feedbacks severely limit the extent to which dissolution rates may be enhanced by microbial activity, though the rate of physical transport modulates this limitation.

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