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Sulfur and iron accumulation in three marine-archaeological shipwrecks in the Baltic Sea: The Ghost, the Crown and the Sword
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
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2014 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 4, 4222- p.Article in journal (Refereed) Published
Abstract [en]

Sulfur and iron concentrations in wood from three 17th century shipwrecks in the Baltic Sea, the Ghost wreck, 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.

Place, publisher, year, edition, pages
2014. Vol. 4, 4222- p.
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Earth and Related Environmental Sciences Chemical Sciences
URN: urn:nbn:se:su:diva-102286DOI: 10.1038/srep04222ISI: 000331956600006OAI: diva2:709883


Available from: 2014-04-03 Created: 2014-03-31 Last updated: 2014-04-03Bibliographically approved

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Grudd, HåkanSandström, Magnus
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Department of Physical Geography and Quaternary GeologyDepartment of Materials and Environmental Chemistry (MMK)
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