Sulfur and iron accumulation in three marine-archaeological shipwrecks in the Baltic Sea. The Ghost, the Crown and the Sword.
Artikel i vetenskaplig tidskrift, 2014

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.

XRF

sediment

shipwrecks

sulfur

XANES

iron

marine-archaeological wood

Författare

Yvonne Fors

Göteborgs universitet

Håkan Grudd

Farideh Jalilehvand

Magnus Sandström

Ingemar Cato

Göteborgs universitet

Lennart Bornmalm

Göteborgs universitet

Scientific Reports

2045-2322 (ISSN)

Vol. 4 artikel nr 4222-

Ämneskategorier

Oorganisk kemi

Analytisk kemi

DOI

10.1038/srep04222