The Influence of Chelating Agents on the Kinetics of Calcite Dissolution

Fredd, C.N.; Fogler, H. Scott

doi:10.1006/jcis.1998.5535

Cited by 212 publications

(141 citation statements)

References 24 publications

(22 reference statements)

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“…Bacto Casitone is made up of hydrolyzed proteins that display a large number of functional groups (carboxylic and amino groups) (70). Molecules with such functional groups can form Ca complexes, i.e., they have a chelating action (27), thereby reducing the Ca activity in the liquid medium to a level where the SI with respect to calcite becomes negative. As a result of such undersaturation, the observed dissolution of the substrate occurs.…”

Section: Discussionmentioning

confidence: 99%

Influence of Substrate Mineralogy on Bacterial Mineralization of Calcium Carbonate: Implications for Stone Conservation

Rodríguez-Navarro

Jroundi

Schiro

et al. 2012

Appl Environ Microbiol

186

101

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ABSTRACTThe influence of mineral substrate composition and structure on bacterial calcium carbonate productivity and polymorph selection was studied. Bacterial calcium carbonate precipitation occurred on calcitic (Iceland spar single crystals, marble, and porous limestone) and silicate (glass coverslips, porous sintered glass, and quartz sandstone) substrates following culturing in liquid medium (M-3P) inoculated with different types of bacteria (Myxococcus xanthus,Brevundimonas diminuta, and a carbonatogenic bacterial community isolated from porous calcarenite stone in a historical building) and direct application of sterile M-3P medium to limestone and sandstone with their own bacterial communities. Field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), powder X-ray diffraction (XRD), and 2-dimensional XRD (2D-XRD) analyses revealed that abundant highly oriented calcite crystals formed homoepitaxially on the calcitic substrates, irrespective of the bacterial type. Conversely, scattered spheroidal vaterite entombing bacterial cells formed on the silicate substrates. These results show that carbonate phase selection is not strain specific and that under equal culture conditions, the substrate type is the overruling factor for calcium carbonate polymorph selection. Furthermore, carbonate productivity is strongly dependent on the mineralogy of the substrate. Calcitic substrates offer a higher affinity for bacterial attachment than silicate substrates, thereby fostering bacterial growth and metabolic activity, resulting in higher production of calcium carbonate cement. Bacterial calcite grows coherently over the calcitic substrate and is therefore more chemically and mechanically stable than metastable vaterite, which formed incoherently on the silicate substrates. The implications of these results for technological applications of bacterial carbonatogenesis, including building stone conservation, are discussed.

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Section: Discussionmentioning

confidence: 99%

Influence of Substrate Mineralogy on Bacterial Mineralization of Calcium Carbonate: Implications for Stone Conservation

Rodríguez-Navarro

Jroundi

Schiro

et al. 2012

Appl Environ Microbiol

186

101

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“…The dissolution of dolomite in EDTA solution was reported to be faster than that in water (Fredd and Fogler, 1998). The over dosage of EDTA may be responsible for the difference.…”

Section: Pulp Chemistry After Millingmentioning

confidence: 98%

Effects of grinding environment on the flotation of Rosh Pinah complex Pb/Zn ore

Wei

Sandenbergh

2007

Minerals Engineering

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The Rosh Pinah orebody is a complex lead-zinc sulphide system with pyrite gangue and minor amounts of copper. Laboratory scale milling and flotation testing of ore samples taken from this operation was performed. Different grinding media and conditions were used, including ceramic, stainless steel and steel. Flotation tests used a sequential recovery protocol for selective flotation of first the lead and thereafter the zinc. The presence of species of oxidation products on the ore after milling was probed using ethylene diamine tetra-acetic acid (EDTA) leaching. The test data show that, for comparable grinds and reagent dosages, the choice of grinding media has a marked effect on the paymetals recoveries and the selectivity. The ceramic mill produced the highest recoveries but the poorest selectivity. The steel mill produced the converse result. It is proposed that this is because the ceramic mill produces an oxidizing environment, allowing sphalerite activation by copper ions, whilst the steel mill produces a reducing environment, preventing this activation.

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“…The addition of EDTA accelerates dissolution, although it does not affect the overall dissolution mechanism (Fredd and Fogler, 1998;Oelkers et al, 2011). To change the ionic strength of the solutions, we used NaCl (BAKER ANALYZED® ACS Reagent) at concentrations in the range 0-500 mM (Table S-1).…”

mentioning

confidence: 99%

Repulsion between calcite crystals and grain detachment during water–rock interaction

Levenson¹,

Emmanuel²

2017

Geochem. Persp. Let.

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doi: 10.7185/geochemlet.1714 Weathering in carbonate rocks is often thought to be governed by chemical dissolution. However, recent studies have shown that mechanical detachment of tiny grains contributes significantly to the overall surface retreat. Whether this detachment is caused by shear forces acting at the surface, or repulsive forces acting between grains, was not known. In this study, we used atomic force microscopy to examine the mechanism of grain detachment and we demonstrate that it occurs even in the absence of shearing fluid flow. This suggests that the removal of grains from rock surfaces can be caused by repulsive forces between calcite grains. Although these repulsive forces are expected to be sensitive to the ionic strength of the solution, we did not find enough evidence to demonstrate a correlation between salinity and the frequency of grain detachment. Importantly, our findings suggest that grain detachment occurs during water-rock interaction under low flow conditions over a range of salinities, with potential impacts on geological carbon sequestration and enhanced oil recovery in carbonate formations.

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The Influence of Chelating Agents on the Kinetics of Calcite Dissolution

Cited by 212 publications

References 24 publications

Influence of Substrate Mineralogy on Bacterial Mineralization of Calcium Carbonate: Implications for Stone Conservation

Influence of Substrate Mineralogy on Bacterial Mineralization of Calcium Carbonate: Implications for Stone Conservation

Effects of grinding environment on the flotation of Rosh Pinah complex Pb/Zn ore

Repulsion between calcite crystals and grain detachment during water–rock interaction

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