Costantini Ilaria, Castro Kepa, Madariaga Juan Manuel, Arana Gorka
Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country UPV/EHU, P.O. Box 644, 48080 Bilbao, Spain.
Molecules. 2022 Jun 4;27(11):3609. doi: 10.3390/molecules27113609.
In this work, micro-Raman spectroscopy and micro-energy-dispersive X-ray fluorescence spectroscopy (µ-EDXRF) were applied on microsamples taken from the footbridge (1927) located in Ondarroa (Basque Country, Spain) in order to investigate the original paint coating and make an evaluation of the conservation state before its restoration. Elemental and molecular images were acquired for the study of the compounds distribution. Some modern pigments such as phthalocyanine blue and green pigments, minium, calcium carbonate, Prussian blue, and hematite were identified. Barium sulfate and titanium dioxide were recognized as opacifier agents. Thanks to the study of the stratigraphies, it has been possible to determine the original paint layer, which includes lead white, ultramarine blue, carbon black, and barium sulfate. In addition, colorimetric analyses made it possible to know the CIELab values of the original layer in order to reproduce the original colour during the planned restoration work. The massive presence of chlorine detected by µ-EDXRF and the corrosion products of the rust layer, in particular akaganeite and hematite, highlighted the atmospheric impact in the conservation of the bridge because they were due to the effect of both marine aerosol and to the presence of acidic components in the environment coming from anthropogenic activity. This work demonstrated the usefulness of a scientific approach for the study of industrial archaeology heritage with the aim to contribute to its conservation and restoration.
在这项工作中，微拉曼光谱和微能量色散X射线荧光光谱（µ-EDXRF）被应用于取自位于西班牙巴斯克地区翁达罗阿的人行天桥（1927年）的微样本，以研究原始油漆涂层，并在修复前评估其保存状态。获取了元素图像和分子图像以研究化合物的分布。鉴定出了一些现代颜料，如酞菁蓝和绿色颜料、铅丹、碳酸钙、普鲁士蓝和赤铁矿。硫酸钡和二氧化钛被识别为遮光剂。通过对地层的研究，得以确定原始漆层，其中包括铅白、群青蓝、炭黑和硫酸钡。此外，比色分析使得了解原始漆层的CIELab值成为可能，以便在计划的修复工作中重现原始颜色。µ-EDXRF检测到的大量氯以及锈层的腐蚀产物，特别是针铁矿和赤铁矿，突出了大气对桥梁保存的影响，因为它们是海洋气溶胶和来自人为活动的环境中酸性成分共同作用的结果。这项工作证明了科学方法在工业考古遗产研究中的有用性，旨在为其保护和修复做出贡献。
