Green Copper Pigments Biodegradation in Cultural Heritage: From Malachite to Moolooite, Thermodynamic Modeling, X-ray Fluorescence, and Raman Evidence

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• 作者：Kepa Castro ; Alfredo Sarmiento ; Irantzu Martí ; nez-Arkarazo ; Juan Manuel Madariaga ; Luis Angel Ferná ; ndez
• 刊名：Analytical Chemistry
• 出版年：2008
• 出版时间：June 1, 2008
• 年：2008
• 卷：80
• 期：11
• 页码：4103 - 4110
• 全文大小：1393K
• 年卷期：v.80,no.11(June 1, 2008)
• ISSN：1520-6882

文摘

Moolooite (copper oxalate), a very rare compound, was found as a degradation product from the decay of malachite in several specimens of Cultural Heritage studied. Computer simulations, based on heterogeneous chemical equilibria, support the transformation of malachite to moolooite through the intermediate copper basic sulfates or copper basic chlorides, depending on the presence of available free sulfate or chloride anions in the chemical system. Raman and X-ray fluorescence spectral evidence found during the analysis of the three case studies investigated supported the model predictions. According to the study, the presence of lichens and other microorganisms might be responsible for the decay phenomena. This work tries to highlight the importance of biological attack on specimens belonging to Cultural Heritage and to demonstrate the consequences of oxalic acid, excreted by some of these microorganisms, on the conservation and preservation of artwork.