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Clay Poultices in Salt Extraction from Ornamental Stones: A Statistical Approach

Published online by Cambridge University Press:  28 February 2024

Maria Angeles Vicente  and
Santiago Vicente-Tavera
Maria Angeles Vicente
Affiliation:
Departamento de Química y Geoquímica Ambiental, IRNA/CSIC, Salamanca, Spain Unidad Asociada CSIC/Universidad de Salamanca, IRNA, Apdo 257, 37071, Salamanca, Spain
Santiago Vicente-Tavera
Affiliation:
Departamento de Estadística, Universidad de Salamanca, Salamanca, Spain Unidad Asociada CSIC/Universidad de Salamanca, IRNA, Apdo 257, 37071, Salamanca, Spain
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Abstract

The extraction of salts by layered (bentonite) and fibrous (sepiolite) clay poultices from stone materials currently used in Heritage buildings was studied. Analyses were performed on stones affected by salts but not submitted to humidity, and also on stones affected by salts and simultaneously submitted to continuous or intermittent humidity during the salt-extraction process. From the experimental results and the statistical analysis, the application of two successive poultices is sufficient for an efficient extraction of Cl− and NO3- in the absence of humidity. However, under humid conditions, the efficiency of the method is reduced considerably. For SO42-, the use of hydrotalcites (anionic clays) is recommended for more effective extraction.

Keywords

BentoniteConservationHistorical Heritage BuildingsMANOVA-BiplotOrnamental StonesPoulticesSaltsSepioliteWeathering of Stone
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 3 , June 2001 , pp. 227 - 235
Copyright
Copyright © 2001, The Clay Minerals Society

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Footnotes

†

Deceased.

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