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首页> 外文期刊>Electroanalysis >Identification of earth pigments by applying hierarchical cluster analysis to solid state voltammetry. Application to severely damaged frescoes
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Identification of earth pigments by applying hierarchical cluster analysis to solid state voltammetry. Application to severely damaged frescoes

机译：通过将层次聚类分析应用于固态伏安法来鉴定大地色素。适用于严重受损的壁画

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摘要

Multivariate chemometric methods are applied for identifying earth pigments from square-wave voltammetric measurements performed at pigment-modified paraffin-impregnated graphite electrodes allowing for a separation between hematite-based earths, French ochres, Spanish ochres, siennas, umbers and green earths. This methodology is applied to the identification of the pigments in samples from the ceiling frescoes of Antonio Palomino (dated 1707) in the vaulted nave of the Sant Joan del Mercat church in Valencia (Spain). These frescoes suffered considerable damage by fire during the Spanish Civil War in 1936, resulting in severe chemical and chromatic alterations. Electrochemical data, supported by scanning electron microscopy/energy dispersive X-ray microanalysis and Raman spectroscopy, indicate that thermal stress induced the transformation of goethite-based yellow ochres into hematite and magnetite.
机译：多元化学计量学方法可用于在颜料改性的石蜡浸渍的石墨电极上进行的方波伏安法测量中鉴定大地色素，从而可将赤铁矿土，法国石，西班牙石，enna色，琥珀色和绿色土分离。该方法用于鉴定西班牙瓦伦西亚的Sant Joan del Mercat教堂的拱形教堂中殿的安东尼奥·帕洛米诺（Antonio Palomino）（1707年）的天花板壁画中的色素。这些壁画在1936年西班牙内战期间遭受了大火的破坏，导致了严重的化学和颜色变化。电化学数据得到扫描电子显微镜/能量色散X射线显微分析和拉曼光谱的支持，表明热应力诱导针铁矿基黄石转变为赤铁矿和磁铁矿。

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