Characterization of model samples simulating degradation processes induced by iron and sulfur species on waterlogged wood

Monachon, Mathilde (University of Neuchâtel, Switzerland) ; Albelda-Berenguer, Magdalena (University of Neuchâtel, Switzerland) ; Pelé, Charlène (Arc'Antique, Nantes, France) ; Cornet, Emilie (Haute Ecole Arc Conservation-Restauration, HES-SO University of Applied Sciences and arts Western Switzerland) ; Guilminot, Elodie (Arc'Antique, Nantes, France) ; Rémazeilles, Céline (CNRS, La Rochelle, France) ; Joseph, Edith (Haute Ecole Arc Conservation-Restauration, HES-SO University of Applied Sciences and arts Western Switzerland ; University of Neuchâtel, Switzerland)

Reduced iron and sulfur species accumulated within waterlogged archaeological wood artefacts during their burial time. Oxygen exposure of the artefacts during recovery leads to acidification and salts precipitation, which causes irreversible physical and chemical damages. Prior to accurately evaluating novel extraction methods, the procedures for creating analogous samples were evaluated for efficacy. Waterlogged wood analogues provide access to a whole set of homogeneous and sacrificial samples that replicate characteristics of waterlogged archaeological wood in terms of content degradation and the presence of reduced iron and sulfur species. In this study, we evaluated the preparation of model samples from fresh balsa wood artificially contaminated with reduced iron and sulfur species. Wood degradation and the formation of reduced iron and sulfur species were assessed by Fourier Transformed Infrared (FTIR) and Raman spectroscopies and validated through statistic methods, such as Principal Component Analysis (PCA). Among the three impregnation protocols investigated, one method appeared to be the most effective in term of iron sulfide formation, especially partially oxidized mackinawite Fe1-xS. The selected protocol proved reproducible and efficient on both fresh balsa and Neolithic oak samples. From these observations confirmed by the PCA analyses on spectroscopic dataset, a suitable method to model waterlogged archaeological wood was established.


Keywords:
Article Type:
scientifique
Faculty:
Design et Arts visuels
Branch:
Conservation
School:
HE-Arc CR
Institute:
Unité de recherche en Conservation-restauration de la Haute Ecole Arc - UR-ARC CR
Subject(s):
Conservation - Restauration
Date:
2020-06
Pagination:
11
Published in:
Microchemicals Journal
Numeration (vol. no.):
2020, 155
DOI:
ISSN:
0026-265X
External resources:
Appears in Collection:



 Record created 2021-03-09, last modified 2021-03-10

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