Sulfur and iron speciation in recently recovered timbers of the Mary Rose revealed via X-ray absorption spectroscopy

Autor:	Robert M. Moss, David M. Pickup, Alan V. Chadwick, T. Skinner, Robert J. Newport, A.M. Jones, Andrew D. Smith, S.W. Goatham, K.M. Wetherall
Rok vydání:	2008
Předmět:	Archeology X-ray absorption spectroscopy Analytical chemistry chemistry.chemical_element Sulfuric acid engineering.material Sulfur XANES Crystallography chemistry.chemical_compound chemistry Jarosite engineering Absorption (chemistry) Spectroscopy Magnetite
Zdroj:	Journal of Archaeological Science. 35:1317-1328
ISSN:	0305-4403
Popis:	This paper reports the results of an investigation into the mechanisms that have led to the build up of sulfuric acid in the timbers of the Mary Rose , with a particular focus on recently recovered timbers. Measurements have been made by sulfur and iron K-edge X-ray absorption near edge spectroscopy (XANES), X-ray microscopy and by X-ray diffraction (XRD). Results from S K-edge XANES studies reveal that the concentration of highly oxidised S decreases with depth into the timber, from ∼15 at.% of S at the surface to negligible levels after approximately 50 mm. Fe K-edge XANES reveals little variation with depth in which Fe 3+ ions are dominant. This sheds some light on the sulfur oxidation path, and indicates Fe 3+ ions are produced by the oxidation mechanisms that are currently underway. XRD studies have identified several mineral components that may form part of the oxidation chain. These are magnetite (Fe 3 O 4 ), jarosite (KFe 3 (SO 4 ) 2 (OH) 6 ) and calcite (CaCO 3 ).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15e144c80e82a6b1c266ca150f3eab49 https://doi.org/10.1016/j.jas.2007.09.007 Zobrazit plný text záznamu Full Text from ScienceDirect