Weathering of dolomite in industrial environments

Gauri, K. Lal; Tambe, Sanjeev S.; Caner-Saltık, Emine N.

doi:10.1007/bf01740578

Cited by 10 publications

(2 citation statements)

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“…Marble deterioration is due to a number of factors involving physical, chemical, and biological factors. Chemical dissolution is enhanced in polluted environments by the presence of nitrogen and sulfur oxides which have a synergistically accelerating effect. − Despite the fact that a rather large number of investigations have been concerned with the dissolution of carbonate rocks in acidic pH, − in Southern Europe, where a large portion of cultural heritage monuments are present, rainwater is often buffered or even made slightly alkaline by the presence of lime-containing dust particles which contribute to an alkaline microenvironment . Moreover, local alkaline conditions often prevail when the calcitic surfaces of marble or limestone are in contact with mortars and/or Portland cement applied in several cases of restoration works .…”

Section: Introductionmentioning

confidence: 99%

The Calcitic Marble/Water Interface: Kinetics of Dissolution and Inhibition with Potential Implications in Stone Conservation

Kanellopoulou

Koutsoukos

2003

Langmuir

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The dissolution of powdered Carrara marble was investigated in the absence and in the presence of (1-hydroxyethylidene)-1,1-diphosphonic acid (HEDP) at conditions of constant undersaturation at pH 8.25. The dependence of the rates of dissolution on the relative undersaturation suggested a surface diffusion controlled mechanism. According to this mechanistic information, the interaction of HEDP with calcitic Carrara marble was investigated. Two types of interaction of the HEDP with the marble suface were studied: preadsorption and addition of HEDP in the undersaturated solutions (1 µM to 1 mM). In both cases the rates of dissolution were drastically reduced depending on the concentration of the organophosphorus compound on the marble surface or in the undersaturated solutions. The rate reduction was attributed to the poisoning of the active dissolution sites through the uptake of HEDP on the calcite crystallites of the Carrara marble. The HEDP uptake by marble was measured quantitatively. The zeta potential was calculated from electrokinetic measurements of marble particle suspensions as a function of pH, pCa, and pCO3 2-. The potential-determining ions of the calcitic marble showed that the uptake of HEDP by the calcitic marble particles resulted in a shift of the surface potential to negative values and over a wide pCa range (2.0-4.5), causing charge reversal. The variation of the suspension pH did not result in significant changes of the surface potential. The examination of the morphology of the dissolving marble grains showed that the initially present small crystallites dissolved first, while in the presence of HEDP, which retarded dissolution, they were preserved.

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Section: Introductionmentioning

confidence: 99%

The Calcitic Marble/Water Interface: Kinetics of Dissolution and Inhibition with Potential Implications in Stone Conservation

Kanellopoulou

Koutsoukos

2003

Langmuir

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“…The SO, reacts with the specimen at the surface, producing a crust of gypsum, CaS04.2H,0. The crust grows outward in continued reaction by the transport of Ca2+ from the unaltered limestone and the resulting reaction of Ca2+ with SO, at the sample surface (Skoulikidis and Charalambous, 1981;Gauri et al, 1992). The details of the formation of gypsum crust, its evolution, morphology, and composition are discussed in Gauri et al (1989).…”

Section: Limestone-so Reactionmentioning

confidence: 99%