Advanced Mapping of Inorganic Treatments on Porous Carbonate Stones by Combined Synchrotron Radiation High Lateral μXRPD and μXRF

Author:

Massinelli Giulia1,Marinoni Nicoletta1,Colombo Chiara2,Gatta Giacomo Diego1,Realini Marco2,Burghammer Manfred3,Possenti Elena2

Affiliation:

1. Università degli Studi di Milano

2. Istituto di Scienze del Patrimonio Culturale (ISPC), Consiglio Nazionale delle Ricerche (CNR)

3. European Synchtron Radiation Facility

Abstract

Abstract

Understanding the effects of consolidating inorganic mineral treatments on carbonate stones of cultural heritage, on the nature and distribution of newly formed products within the matrix, poses a significant challenge in Heritage Science and Conservation Science. Existing analytical methods often fail to deliver spatial and compositional insights into the newly formed crystalline phases with the appropriate high lateral resolution. In this study, we explore the capabilities and limitations of synchrotron radiation (SR) micro-X-ray powder diffraction (µXRPD) mapping combined with micro-X-ray fluorescence (µXRF) to give insight into compounds formed following the application of ammonium oxalate (AmOx) and diammonium phosphate-based (DAP) solutions on porous carbonate stone. Ultimately, the integration of µXRPD mapping and µXRF analysis proved itself a powerful asset in providing precise qualitative and quantitative data on the newly formed phases, in the case of both calcium oxalates (CaOxs) and calcium phosphates (CaPs), and their complex stratigraphic distribution, thus opening a new route for applications to a more comprehensive study of inorganic treatments applied to carbonate substrates.

Publisher

Research Square Platform LLC

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