Arrizabalaga Iker, Gómez-Laserna Olivia, Aramendia Julene, Arana Gorka, Madariaga Juan Manuel
Department of Analytical Chemistry, University of the Basque Country UPV/EHU, P.O. Box 644, E-48080 Bilbao, Basque Country, Spain.
Department of Analytical Chemistry, University of the Basque Country UPV/EHU, P.O. Box 644, E-48080 Bilbao, Basque Country, Spain.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Apr 24;124:308-14. doi: 10.1016/j.saa.2014.01.017. Epub 2014 Jan 19.
In this work the determination of the pigments present in a decorative wallpaper of the middle nineteenth century from the Santa Isabel factory (Vitoria-Gasteiz, Basque Country, Spain) has been performed by a combination of mid-Diffuse Reflectance Infrared Spectroscopy (DRIFT) and Far Infrared Spectroscopy (FIR) in transmission mode. The DRIFT is a powerful infrared technique that is not widely used in the analyses of artworks in spite of being especially adequate for powdered samples. In this mode, sample pretreatment is not required and the obtained spectra are easier to solve than those obtained in transmittance mode. Those pigments which are not active in the mid-infrared region may be determined easily by FIR. In the last decade, in the field of painted materials very few studies performed by far infrared spectroscopy and mid infrared spectroscopy in diffuse reflectance mode can be found. In most of them the researchers have used one of these techniques, but in no case the combination of both. As we demonstrate in this work, combining these two techniques a complete characterization of the wallpaper can be carried out. Small samples were collected from the wallpaper for the analysis of the rose, brown, yellow and blue colours. In this way, minium (Pb3O4), calcite (CaCO3), barium sulphate (BaSO4), prussian blue (Fe7C18N18), iron oxide yellow (α-FeOOH), vermillion (HgS) and carbon black pigment from organic origen were detected. Finally, the validation was carried out by XRF and Raman spectroscopy getting the same results as with the combination of diffuse reflectance infrared spectroscopy and far infrared spectroscopy.
在这项工作中，通过中红外漫反射光谱（DRIFT）和透射模式的远红外光谱（FIR）相结合的方法，对来自西班牙巴斯克地区维多利亚 - 加斯泰兹的圣伊莎贝尔工厂的19世纪中叶装饰壁纸中的颜料进行了测定。DRIFT是一种强大的红外技术，尽管它特别适用于粉末状样品，但在艺术品分析中并未得到广泛应用。在这种模式下，无需进行样品预处理，并且所获得的光谱比在透射模式下获得的光谱更容易解析。那些在中红外区域不活跃的颜料可以通过FIR轻松测定。在过去十年中，在绘画材料领域，很少能找到采用远红外光谱和漫反射模式的中红外光谱进行的研究。在大多数研究中，研究人员只使用了其中一种技术，而从未将两者结合使用。正如我们在这项工作中所展示的，结合这两种技术可以对壁纸进行全面表征。从壁纸上采集了小样本，用于分析玫瑰色、棕色、黄色和蓝色。通过这种方式，检测到了铅丹（Pb3O4）、方解石（CaCO3）、硫酸钡（BaSO4）、普鲁士蓝（Fe7C18N18）、氧化铁黄（α - FeOOH）、朱砂（HgS）以及来自有机来源的炭黑颜料。最后，通过X射线荧光光谱（XRF）和拉曼光谱进行了验证，得到了与漫反射红外光谱和远红外光谱相结合的方法相同的结果。
