Degradation of ceramic sculptures on the Cathedral of Seville
1986
Maqueda Porras, Celia | Pérez Rodríguez, José Luis | Justo, Ángel
8 pages, 4 figures, 2 tables, 16 references. Aparece en la serie Mineralogica et Petrographica Acta volume XXIX-A. Congreso celebrado del 24-28, septiembre, 1984, en Seiano di Vico Equense y Amalfi, Italia. Esta publicación se encuentra en el Catálogo Bibliográfico el CSIC, con el número de registro en ALEPH: 000137990. En el IRNAS se encuentran originales para su consulta.
Mostrar más [+] Menos [-]The alteration of the statues adorning the Baptism and Birth Porticos of the Cathedral of Seville (Spain) made by Lorenzo Mercadante was studied. The statues are covered by dust which contains organic matter, nitrogen (organic and ammoniacal) and phosphorus coming from animal excrements and other environmental contamination. The lead content, caused by petrol combustion is very high (0.38%). The study of the ceramics shows sulphur contents changing from 0.81% in the altered ceramic to 0.26% in the unaltered parts. Some zones of the surface have a reddish colour and a similar composition to the ceramic, but with a higher iron content. Accumulation of iron oxides on the surface comes from release of this e1ement from the ceramic and ulterior precipitation. The environment provides S02, SH2, CO2, Pb, nitrogen compounds, humidity, mechanical erosion, etc., and also salts (external and from the ceramic), that cause considerable alteration of these ceramic sculptures.
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