Sulfur and iron concentrations in wood from three 17th century shipwrecks in the Baltic Sea, the Ghostwreck, the Crown and the Sword, were obtained by X-ray fluorescence (XRF) scanning. In near anaerobic environments symbiotic microorganisms degrade waterlogged wood, reduce sulfate and promote accumulation of low-valent sulfur compounds, as previously found for the famous wrecks of the Vasa and Mary Rose. Sulfur K-edge X-ray absorption near-edge structure (XANES) analyses of Ghost wreck wood show that organic thiols and disulfides dominate, together with elemental sulfur probably generated by sulfur-oxidizing Beggiatoa bacteria. Iron sulfides were not detected, consistent with the relatively low iron concentration in the wood. In a museum climate with high atmospheric humidity oxidation processes, especially of iron sulfides formed in the presence of corroding iron, may induce post-conservation wood degradation. Subject to more general confirmation by further analyses no severe conservation concerns are expected for the Ghost wreck wood.
Sulfur and iron accumulation in three marine-archaeological shipwrecks in the Baltic Sea: The Ghost, the Crown and the Sword
Yvonne Fors,H. Grudd,A. Rindby,F. Jalilehvand,M. Sandström,I. Cato,Lennart Bornmalm
Published 2014 in Scientific Reports
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- Publication year
2014
- Venue
Scientific Reports
- Publication date
2014-02-27
- Fields of study
Medicine, Chemistry, Environmental Science, History
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Semantic Scholar, PubMed
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