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Lead Chlorides in Paint on a Della Robbia Terracotta Sculpture.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-02-20 , DOI: 10.1021/acs.analchem.9b05045 Xiao Ma 1 , Barbara H Berrie 1
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-02-20 , DOI: 10.1021/acs.analchem.9b05045 Xiao Ma 1 , Barbara H Berrie 1
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Materials in the paint layers of an early sixteenth-century painted and glazed terracotta sculpture by Giovanni della Robbia, Pietà were identified. The presence of the rare lead chloride salts, cotunnite (PbCl2) and challacolloite (KPb2Cl5), were confirmed using Raman spectroscopy and electron back scatter diffraction. Well-formed habit of large crystals of challacolloite indicates slow growth from solution. The stability and potential pathways for the in-situ formation of lead chloride compounds are discussed. The presence of lead chloride phases in the Pietà indicates conditions of high chloride ion concentrations (i.e., activities) and/or low pH led to the alteration of the pigment lead white (hydrocerussite, 2PbCO3·Pb(OH)2). This work highlights the role of ion transport in alteration of artists' materials and emphasizes the importance of considering the role of treatments and envi-ronmental factors in changes in materials, and reinforces our awareness of the on-going chemistry occurring in works of art.
中文翻译：
德拉罗比亚兵马俑雕塑上的涂料中的氯化铅。
确定了皮耶塔（Pietà）乔瓦尼·德拉·罗比亚（Giovanni della Robbia）于16世纪早期绘制并上釉的兵马俑雕塑中的涂料层中的材料。使用拉曼光谱法和电子背散射衍射法确认了稀有氯化铅盐，白云母（PbCl2）和硅铝石（KPb2Cl5）的存在。钙铝石大晶体的良好习惯表明从溶液中缓慢生长。讨论了就地形成氯化铅化合物的稳定性和潜在途径。Pietà中氯化铅相的存在表明高氯离子浓度（即活性）和/或低pH值导致颜料铅白（水铁矿，2PbCO3·Pb（OH）2）改变的条件。这项工作突出了离子迁移在改变艺术家作品中的作用。
更新日期：2020-03-09
中文翻译：
德拉罗比亚兵马俑雕塑上的涂料中的氯化铅。
确定了皮耶塔（Pietà）乔瓦尼·德拉·罗比亚（Giovanni della Robbia）于16世纪早期绘制并上釉的兵马俑雕塑中的涂料层中的材料。使用拉曼光谱法和电子背散射衍射法确认了稀有氯化铅盐，白云母（PbCl2）和硅铝石（KPb2Cl5）的存在。钙铝石大晶体的良好习惯表明从溶液中缓慢生长。讨论了就地形成氯化铅化合物的稳定性和潜在途径。Pietà中氯化铅相的存在表明高氯离子浓度（即活性）和/或低pH值导致颜料铅白（水铁矿，2PbCO3·Pb（OH）2）改变的条件。这项工作突出了离子迁移在改变艺术家作品中的作用。
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