Isolation and characterization of barium sulphate and titanium oxides in monuments crusts

2 páginas, 1 referencia. Poster contributions- O-343 presentado en el VIII International symposium on analytical methodology in the environmental field. XIII Reunión de la Sociedad española de química analítica, VIII ISAMEF/SEQA 2003. University of A Coruña October 21-24, 2003.

The surface layers of ornamental materials of monuments and historic buildings are altered by the interaction of the original materials with environmental pollutants, producing weathering crusts on the exposed surface. Different studies have shown that the surface layers of ornamental materials may contain many components from the environment and/or from the alteration processes. Although there are many works on the elements present in polluted surface layers, little attention has been given to the presence of titanium and barium, particularly the latter. Both elements are present in rock materials of historic buildings; in addition, barite may be added to the surface of ornamental materials for consolidation. Ti and Ba containing materials, are present in crusts. They are in low proportion, making them (and particularly the latter) difficult to characterise by mineralogical techniques, such as X-ray diffraction. For this reason, works on the mineralogical composition of the two elements in monument crusts are scarce. Therefore, for a better understanding of the alteration processes of ornamental material, it is important to determine Ba and Ti in the surface layers, and the phases in which they are present, especially when they are in low concentration. The aim of this study is to present an experimental method for the isolation and characterisation of barium sulphate and titanium oxides in the surface layers on ornamental monuments.

Xunta de Galicia: Consellería de Medio Ambiente. Dirección Xeral do Centro de Desenvolvemento Sostible. Xunta de Galicia: Consellería de Innovación, de Industria e Comercio. Dirección Xeral de Investigación e Desenvolvemento. Xunta de Galicia: Consellería de Educación e Ordenación Universitaria. Dirección Xeral de Universidades. Ministerio de Ciencia y Tecnología. Dirección General de Investigación. Excma. Diputación Provincial de A Coruña. Excmo. Ayuntamiento de A Coruña REPSOL, YPF, ENDESA GENERACIÓN, SIR, ENCE, GAIRESA, UNIÓN FENOSA, TIRME.

Peer reviewed