Assessment of Various Iron Extraction Treatments on Waterlogged Archaeological Oak - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Forests Année : 2023

Assessment of Various Iron Extraction Treatments on Waterlogged Archaeological Oak

Charlène Pelé-Meziani
  • Fonction : Auteur
  • PersonId : 1121972
Lorena Sozzi
  • Fonction : Auteur
  • PersonId : 1313746
Elodie Guilminot
Gwenaël Lemoine
  • Fonction : Auteur
  • PersonId : 1313747

Résumé

Treatments of organic objects to extract ferrous compounds from waterlogged archaeological wood are well documented. For several years, numerous laboratories have been seeking to determine suitable conservation treatments for such organic objects. For chemical treatments, complexing agents such as EDTA and DTPA, along with acids such as citric and oxalic acids, were selected. In addition, oxidants and reducing agents were tested as pre-treatments to improve extraction rates. In fact, chemicals produce a selective reaction on ferrous compounds, which may improve or be inhibited by complexation or dissolution reactions. Their action depends on the type of compound to be extracted and those present inside the wood. The objective of this study was to make a comparative assessment of the various chemical conservation treatments identified and complement the evaluation of their extraction efficiency with a study of their impact on organic matter by adding criteria such as their visual aspect (using a spectrocolorimeter) and physicochemical actions by means of infrared spectroscopy and micromorphological observations. The effectiveness of EDTA was confirmed, as was that of citric acid, despite some questions arising concerning the presence of wood fibers in the treatment solution, even after rinsing. On the other hand, the extraction rate of oxalic acid, which has a very acidic pH, was unsurprisingly lower, but its visual and anatomical results raised the possibility of using it over a short period of time in view of the effectiveness observed on the wood surface. Pre-treatments improved extraction rates, except in the case of EDTA, which independently had a high extraction rate. It was observed that pre-treatments did not appear to cause any significant chemical degradation of the organic matter. This study provides a tool to assist conservators in selecting a chemical treatment that is in line with the state of decay of the wood, the characteristics of the ferrous compounds to be extracted, and the conservation objectives.
Fichier principal
Vignette du fichier
forests-14-01834-v2.pdf (14.67 Mo) Télécharger le fichier
Origine : Publication financée par une institution

Dates et versions

hal-04303566 , version 1 (23-11-2023)

Identifiants

Citer

Charlène Pelé-Meziani, Nicola Macchioni, Lorena Sozzi, Elodie Guilminot, Gwenaël Lemoine, et al.. Assessment of Various Iron Extraction Treatments on Waterlogged Archaeological Oak. Forests, 2023, 14 (9), pp.1834. ⟨10.3390/f14091834⟩. ⟨hal-04303566⟩
14 Consultations
3 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More