Characterization of model samples simulating degradation processes induced by iron and sulfur species on waterlogged wood
| Autor: | Emilie Cornet, Elodie Guilminot, C. Rémazeilles, Mathilde Monachon, Charlène Pelé, Edith Joseph, Magdalena Albelda-Berenguer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Precipitation (chemistry)
010401 analytical chemistry chemistry.chemical_element Iron sulfide 02 engineering and technology Direct reduced iron Contamination engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Sulfur 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound chemistry Mackinawite Environmental chemistry engineering Degradation (geology) Fourier transform infrared spectroscopy 0210 nano-technology Spectroscopy |
| Zdroj: | Microchemical Journal. 155:104756 |
| ISSN: | 0026-265X |
| DOI: | 10.1016/j.microc.2020.104756 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect